Tudor Black Bay homages

Choose a Black Bay branch first.

39 mm across20 homages

See the 1
Tudor Black Bay M79030B-0001
The watch shown is the M79030B-0001. Homages follow other references too, so compare shape and scale.

How to recognise one

Six marks make the look. The count says how many of the 20 homages keep each one.

  • Snowflake hour hand

    1 of 20 keep it, 18 not compared yet. The hour hand ends in a lumed square, and the seconds hand carries a matching square.

  • Triangle at 12

    2 of 20 keep it, 18 not compared yet. A lumed triangle at 12 that points to the centre of the dial.

  • Round hour plots

    2 of 20 keep it, 18 not compared yet. Lumed circles fill the other hours around the triangle and the three bars.

  • Bars at 3, 6 and 9

    0 of 20 keep it, 18 not compared yet. Rectangular lumed bars mark 3, 6 and 9, and no date window breaks the dial at 6.

  • Coin-edge dive bezel

    1 of 20 keep it, 19 not compared yet. A bezel with a knurled edge and a blue insert, numbered every ten minutes.

  • Large crown

    1 of 20 keep it, 19 not compared yet. A large knurled crown stands clear of the case, with no guards.

Each close-up covers about 12.5 mm of watch, using the listed case width and estimated photo edges.

The 1 that follow the 79830RB

Most marks kept first.

Drawn to scale by listed case width.

Original specifications

Sizes and specifications apply to the version named below. Other versions can differ.

79030

Assigned base reference 79030 covers the Black Bay Fifty-Eight model family. Body-read sources identify black M79030N-0001 and blue M79030B-0001 configurations. Shared 39 mm diameter and 20 mm lug width are supported across both; colour-specific thickness and lug-to-lug readings conflict and remain unresolved for the base code.

Specifications for 79030
SpecificationValueSources and notes
Case width39 mmTudor Black Bay Fifty-Eight Black (79030N) | WatchSize.ioTudor Black Bay Fifty-Eight 79030B-0001 | The 1916 CompanyReference 79030N | Tudor Black Bay Fifty-Eight press sheet

Sources agree.

The 79030N black and 79030B blue configurations both have 39 mm cases; Tudor’s press sheet supports 79030N and The 1916 Company identifies 79030B-0001.

Lug to lug47 mmHands-On: The Tudor Black Bay Fifty-Eight Navy Blue | Hodinkee

One cited source.

Hodinkee hands-on review of 79030B lists 47 mm lug-to-lug. It directly describes the case as unchanged from the gilt sibling, so the case span applies to base 79030. This source-specific value is selected while the differing listings remain retained as alternatives, not treated as rounding.

Sources differ

Alternative reports remain visible and are not being treated as rounding. Selected Hodinkee hands-on value for the documented shared case: 47 mm. The source gives no common caliper protocol for all publishers.

Thickness11.9 mmHands-On: The Tudor Black Bay Fifty-Eight Navy Blue | Hodinkee

One cited source.

Hodinkee hands-on review of 79030B lists 11.9 mm thickness inclusive of the boxed sapphire crystal. It directly describes the case as unchanged from the gilt sibling, so the thickness applies to base 79030. This source-specific value is selected while the differing listings remain retained as alternatives, not treated as rounding.

Sources differ

Alternative reports remain visible and are not being treated as rounding. Selected Hodinkee hands-on value for the documented shared case: 11.9 mm. The source gives no common caliper protocol for all publishers.

Lug width20 mmTudor Black Bay Fifty-Eight Black (79030N) | WatchSize.ioTudor Black Bay Fifty-Eight 79030B-0001 | The 1916 Company

Sources agree.

The 79030N and 79030B-0001 configurations both list 20 mm lug width, supporting the base Black Bay 58 model.

Sources and unconfirmed details
79030N

Assignment names exact reference 79030N.

Specifications for 79030N
SpecificationValueSources and notes
Case width39 mmTudor Black Bay Fifty-Eight 79030N

One primary source.

The manufacturer's read technical material specifies 39 mm for ref. 79030N; no independent matching observation was read.

Lug to lug47 mmTudor Black Bay Fifty-Eight

One cited source.

One read source reports 47 mm for ref. 79030N; treat as a single-source figure.

Thickness11.9 mmTudor Black Bay Fifty-Eight

One cited source.

One read source reports 11.9 mm for ref. 79030N; treat as a single-source figure.

Lug width20 mmTudor Black Bay Fifty-Eight

One cited source.

ChronoDB’s read page explicitly lists a 20 mm lug width for ref. 79030N. Tudor’s press kit does not state lug width.

Movement calibreMT5402Tudor Black Bay Fifty-Eight 79030N

One primary source.

The manufacturer's read technical material specifies MT5402 for ref. 79030N; no independent matching observation was read.

Case materialsteelTudor Black Bay Fifty-Eight 79030N

One primary source.

The manufacturer's read technical material specifies steel for ref. 79030N; no independent matching observation was read.

Crystaldomed sapphireTudor Black Bay Fifty-Eight 79030N

One primary source.

The manufacturer's read technical material specifies domed sapphire for ref. 79030N; no independent matching observation was read.

Water resistance200 mTudor Black Bay Fifty-Eight 79030N

One primary source.

The manufacturer's read technical material specifies 200 m for ref. 79030N; no independent matching observation was read.

Bezelunidirectional steel with black anodised aluminium discTudor Black Bay Fifty-Eight 79030N

One primary source.

The manufacturer's read technical material specifies unidirectional steel with black anodised aluminium disc for ref. 79030N; no independent matching observation was read.

Power reserve70 hoursTudor Black Bay Fifty-Eight 79030N

One primary source.

The manufacturer's read technical material specifies 70 hours for ref. 79030N; no independent matching observation was read.

Sources and unconfirmed details
7941A1A0NU

Exact 2024 Black Bay 41 reference, black dial and black bezel on bracelet.

Specifications for 7941A1A0NU
SpecificationValueSources and notes
Case width41 mmTUDOR Black Bay press kit, reference 7941A1A0NU

One primary source.

The manufacturer's read technical material specifies 41 mm for ref. 7941A1A0NU; no independent matching observation was read.

Lug to lug49.3 mmTudor Black Bay Monochrome exact ref listing – Timekeeper PH

One cited source.

Timekeeper PH exact-reference listing reports 49.3 mm L2L. Tempus Europa reports 50 mm; choose the exact seller listing and retain the database alternative.

Thickness13.6 mmTUDOR Black Bay M7941A1A0NU-0001 official product pageTudor Black Bay Monochrome exact ref listing – Timekeeper PH

Sources agree.

Tudor official exact-reference page lists 13.6 mm; Timekeeper PH independently lists the same.

Lug width21 mmTUDOR Black Bay M7941A1A0NU-0001 official product pageTudor Black Bay Monochrome exact ref listing – Timekeeper PH

Sources agree.

Tudor official exact-reference page lists 21 mm lug width; Timekeeper PH independently lists the same.

Movement typeself-winding mechanicalTUDOR Black Bay press kit, reference 7941A1A0NU

One primary source.

The manufacturer's read technical material specifies self-winding mechanical for ref. 7941A1A0NU; no independent matching observation was read.

Movement calibreMT5602-UTUDOR Black Bay press kit, reference 7941A1A0NU

One primary source.

The manufacturer's read technical material specifies MT5602-U for ref. 7941A1A0NU; no independent matching observation was read.

Case materialstainless steelTUDOR Black Bay press kit, reference 7941A1A0NU

One primary source.

The manufacturer's read technical material specifies stainless steel for ref. 7941A1A0NU; no independent matching observation was read.

Crystaldomed sapphireTUDOR Black Bay press kit, reference 7941A1A0NU

One primary source.

The manufacturer's read technical material specifies domed sapphire for ref. 7941A1A0NU; no independent matching observation was read.

Water resistance200 mTUDOR Black Bay press kit, reference 7941A1A0NU

One primary source.

The manufacturer's read technical material specifies 200 m for ref. 7941A1A0NU; no independent matching observation was read.

Bezelunidirectional 60-minute stainless steel bezel with black aluminium insertTUDOR Black Bay press kit, reference 7941A1A0NU

One primary source.

The manufacturer's read technical material specifies unidirectional 60-minute stainless steel bezel with black aluminium insert for ref. 7941A1A0NU; no independent matching observation was read.

Functionshours, minutes, seconds; stop secondsTUDOR Black Bay press kit, reference 7941A1A0NU

One primary source.

The manufacturer's read technical material specifies hours, minutes, seconds; stop seconds for ref. 7941A1A0NU; no independent matching observation was read.

LumeGrade A Swiss Super-LumiNovaTUDOR Black Bay press kit, reference 7941A1A0NU

One primary source.

The manufacturer's read technical material specifies Grade A Swiss Super-LumiNova for ref. 7941A1A0NU; no independent matching observation was read.

Power reserve70 hoursTUDOR Black Bay press kit, reference 7941A1A0NU

One primary source.

The manufacturer's read technical material specifies 70 hours for ref. 7941A1A0NU; no independent matching observation was read.

Sources and unconfirmed details
79470

Assigned catalogue reference 79470.

Specifications for 79470
SpecificationValueSources and notes
Case width39 mmBlack Bay Pro M79470-0001 | Tudor

One primary source.

Selected because this read source states the exact reference-specific value.

Lug to lug47.2 mmComprehensive Guide to Tudor Sizes | Everest Bands

One cited source.

Exact-reference fit guide states 47.2 mm lug-to-lug.

Thickness14.6 mmBlack Bay Pro M79470-0001 | Tudor

One primary source.

Selected because this read source states the exact reference-specific value.

Lug width20 mmBlack Bay Pro M79470-0001 | Tudor

One primary source.

Selected because this read source states the exact reference-specific value.

Movement calibreMT5652Black Bay Pro M79470-0001 | Tudor

One primary source.

Selected because this read source states the exact reference-specific value.

Case materialsteelBlack Bay Pro M79470-0001 | Tudor

One primary source.

Selected because this read source states the exact reference-specific value.

Crystaldomed sapphireBlack Bay Pro M79470-0001 | Tudor

One primary source.

Selected because this read source states the exact reference-specific value.

Water resistance200 mBlack Bay Pro M79470-0001 | Tudor

One primary source.

Selected because this read source states the exact reference-specific value.

LumeNot confirmed

Not stated on the official technical page.

Power reserve70 hoursBlack Bay Pro M79470-0001 | Tudor

One primary source.

Selected because this read source states the exact reference-specific value.

WeightNot confirmed

Not stated on the official technical page.

Sources and unconfirmed details
  • Not stated on the official technical page.
  • Not stated on the official technical page.
79000N

Exact reference 79000N supplied by assignment.

Specifications for 79000N
SpecificationValueSources and notes
Case width37 mmTudor Black Bay 54 M79000N-0001 Reference Page | Tempus Europa

One cited source.

Only one body-read publisher supports this value.

Lug to lug46 mmTudor Black Bay 54 M79000N-0001 Reference Page | Tempus Europa

One cited source.

The body-read source Tudor Black Bay 54 M79000N-0001 Reference Page | Tempus Europa identifies reference 79000N and reports lug to lug mm as 46 mm; no second independent body-read source confirmed this value. Tempus reference page.

Thickness11.24 mmTudor Black Bay 54 M79000N-0001 Reference Page | Tempus Europa

One cited source.

Tempus exact-reference page; Tudor official search result says 11.2 mm but its body was not read.

Lug width20 mmTudor Black Bay 54 M79000N-0001 Reference Page | Tempus Europa

One cited source.

Only one body-read publisher supports this value.

Movement calibreMT5400Tudor Black Bay 54 M79000N-0001 Reference Page | Tempus Europa

One cited source.

Only one body-read publisher supports this value.

Water resistance200 mTudor Black Bay 54 M79000N-0001 Reference Page | Tempus Europa

One cited source.

The body-read source Tudor Black Bay 54 M79000N-0001 Reference Page | Tempus Europa identifies reference 79000N and reports water resistance m as 200 m; no second independent body-read source confirmed this value.

Power reserve70 hoursTudor Black Bay 54 M79000N-0001 Reference Page | Tempus Europa

One cited source.

The body-read source Tudor Black Bay 54 M79000N-0001 Reference Page | Tempus Europa identifies reference 79000N and reports power reserve hours as 70 hours; no second independent body-read source confirmed this value.

Sources and unconfirmed details
79830RB

Exact reference 79830RB supplied by assignment.

Specifications for 79830RB
SpecificationValueSources and notes
Case width41 mmTudor Black Bay GMT M79830RB-0001 Reference Page | Tempus Europa

One cited source.

Only one body-read publisher supports this value.

Lug to lug50 mmTudor Black Bay GMT M79830RB-0001 Reference Page | Tempus Europa

One cited source.

The body-read source Tudor Black Bay GMT M79830RB-0001 Reference Page | Tempus Europa identifies reference 79830RB and reports lug to lug mm as 50 mm; no second independent body-read source confirmed this value. Tempus exact reference.

Thickness14.6 mmTudor Black Bay GMT M79830RB-0001 Reference Page | Tempus Europa

One cited source.

Only one body-read publisher supports this value.

Lug width22 mmTudor Black Bay GMT M79830RB-0001 Reference Page | Tempus Europa

One cited source.

Only one body-read publisher supports this value.

Movement calibreMT5652Tudor Black Bay GMT M79830RB-0001 Reference Page | Tempus Europa

One cited source.

The body-read source Tudor Black Bay GMT M79830RB-0001 Reference Page | Tempus Europa identifies reference 79830RB and reports movement calibre as MT5652; no second independent body-read source confirmed this value.

Water resistance200 mTudor Black Bay GMT M79830RB-0001 Reference Page | Tempus Europa

One cited source.

The body-read source Tudor Black Bay GMT M79830RB-0001 Reference Page | Tempus Europa identifies reference 79830RB and reports water resistance m as 200 m; no second independent body-read source confirmed this value.

Power reserve70 hoursTudor Black Bay GMT M79830RB-0001 Reference Page | Tempus Europa

One cited source.

The body-read source Tudor Black Bay GMT M79830RB-0001 Reference Page | Tempus Europa identifies reference 79830RB and reports power reserve hours as 70 hours; no second independent body-read source confirmed this value.

Sources and unconfirmed details
M79030B-0001Shown in the photograph

The pictured blue Black Bay 58 is M79030B-0001 on the riveted steel bracelet. The exact-reference dealer review and fitment page supply its dimensions.

Specifications for M79030B-0001
SpecificationValueSources and notes
Case width39 mmyoutube.com | M79030B-0001media.tudorwatch.com | M79030B-0001

Sources agree.

The maker navy blue79030B press sheet and the exact-reference dealer review description both give39mm.

Lug to lug47.5 mmdelugs.com | M79030B-0001

One cited source.

Selected from the body-read source for the pictured model.

Sources differ

Delugs states 47.5 mm overall span. The verified 1916 Company review description gives 47.8 mm. Retain the fitment value and preserve the measured difference.

  • 47.5 mm
  • 47.8 mm
Thickness12.1 mmyoutube.com | M79030B-0001

One cited source.

The exact-reference dealer review description reports a measured 12.1 mm thickness.

Lug width20 mmdelugs.com | M79030B-0001

One cited source.

Selected from the body-read source for the pictured model.

Movement typeautomaticmedia.tudorwatch.com | M79030B-0001

One primary source.

Selected from the body-read source for the pictured model.

Movement calibreMT5402media.tudorwatch.com | M79030B-0001

One primary source.

Selected from the body-read source for the pictured model.

Water resistance200 mmedia.tudorwatch.com | M79030B-0001

One primary source.

Selected from the body-read source for the pictured model.

Power reserve70 hoursmedia.tudorwatch.com | M79030B-0001

One primary source.

Selected from the body-read source for the pictured model.

Sources and unconfirmed details

More about the Black Bay

Lay a homage over the TudorAny of the 20, laid over the original at one scale

Lay a homage over the Tudor

Slide to fade from one watch to the other and compare the case shapes. The figures below describe the version shown in the photograph.

Tudor Black Bay39Tudor Black Bay
Hager Aquamariner41Hager Aquamariner

Photos use listed case widths and automatic case-edge readings. The readings have not been manually audited. Photo proportions stay unchanged. Perspective and lug length can differ.

41 mm, 2 mm wider than the Tudor
Tudor Black Bay photo: M79030B-0001. Hager Aquamariner photo: Hager Aquamariner Black, DLC black case and bracelet.

M79030B-0001, specifications and sources

Tudor and the selected homage, measure by measure
MeasureTudorHager Aquamariner
Case width39 mm41 mm
Lug to lug47.5 mmNot listed yet
Thickness12.1 mmNot listed yet
Lug width20 mmNot listed yet
MovementMT5402Miyota 8215
Power reserve70 hours42 hours
Water200 mNot listed yet
PriceNot tracked hereNot listed yet

Side view

12.1 39 wide 47.5 lug to lug
Tudor

Thickness not listed yet

Hager Aquamariner

Copies

  • Triangle at 12
  • Round hour plots
  • Coin-edge dive bezel
  • Large crown

Gives it away

  • Mercedes-style hour hand where the Black Bay has a snowflake hand
  • Date at 3 in place of the bar
  • Black coated case and black bezel where the 79220R has a steel case and red bezel
Open the Hager Aquamariner
The buying guideResearched picks, the references, and questions buyers ask

The guide's researched picks

Swipe along the bench to see all 4.

Octopus Kraken OCT008, black dial and PT5000: Octopus Kraken OCT008

Consider this OCT008 for a 39 mm Black Bay 58-style automatic with a rivet bracelet. The brand lists 47 mm lug-to-lug and 12.5 mm thickness including glass.

The compromise. The OCT008 has a ceramic bezel; the Tudor 79030N has anodised aluminium. Its PT5000 is a different movement from Tudor's MT5402. The same 39 mm does not mean the same fit or finishing.

Price
about £225 $300, seen 2 Oct
Movement
PT5000
Case
39 mm wide, 47 mm lug to lug, 12.5 mm thick
Water
200 m
Details and where to buy

Octopus Kraken OCT025, black dial, red bezel and PT5004: Octopus Kraken OCT025

Consider this 37 mm OCT025 if you want a compact automatic and prefer a red bezel. The maker and seller list a 45.5 mm lug-to-lug span.

The compromise. The red bezel departs from the black-bezel Tudor 54. Both listings say 11.2 mm thick but disagree on whether that includes the glass, so the thickness is not compared.

Price
about £200 $266, seen 2 Oct
Movement
PT5004
Case
37 mm wide, 45.5 mm lug to lug
Water
200 m
Details and where to buy

San Martin SN0109G, blue/red bezel and NH34: San Martin SN0109 GMT

Choose this SN0109G if you want a 39 mm GMT with a separately adjustable 24-hour hand. San Martin lists 48.5 mm lug-to-lug and 13 mm thickness; TMI documents the NH34 setting procedure.

The compromise. The NH34 sets the 24-hour hand on its own, while the Tudor GMT jumps its local hour and moves the date with it. San Martin lists 100 m water resistance, against Tudor's 200 m for the 79830RB.

Price
Not listed yet
Movement
NH34
Case
39 mm wide, 48.5 mm lug to lug, 13 mm thick
Water
100 m
Details and where to buy

Before you choose

Updated 4 October 2026.

In brief

Choose a Black Bay branch first. The 54 is 37 mm, the 58 is 39 mm and the 2024 three-hand Black Bay is 41 mm. The 79830RB GMT is also 41 mm, but adds a 24-hour hand, a date and a different bezel.

The shortlist below gives a 37 mm red-bezel automatic, a 39 mm black-dial automatic and a 39 mm GMT. They answer different choices. A familiar dial does not make their movement, bezel or fit the same.

The 54, 58 and 41 mm diver are different references

Tudor identifies its angular Snowflake hands as a Black Bay design signature. That shared visual cue does not make the 54, 58, 41 mm and GMT specifications interchangeable.

The 37 mm 79000N uses MT5400 and an aluminium bezel insert without minute graduations. The 39 mm 79030N uses MT5402 and a graduated 60-minute black aluminium disc. Case size and bezel printing both change.

The 2024 black-bezel 7941A1A0NU is a 41 mm three-hand model with MT5602-U. Its specifications do not describe the compact 54 or 58, and they do not describe the 79830RB GMT.

Which hand moves when you change time zones?

Tudor's MT5652 lets the local hour jump independently, and the date follows that hand. Its central 24-hour hand and 24-hour bezel support additional time zones.

TMI's NH34 manual assigns the first crown position to the date and 24-hour hand. The second sets the main hour and minute hands. On the SN0109G, you therefore adjust the GMT hand separately rather than getting Tudor's jumping local-hour operation.

Choose the setting behaviour that suits the job. If changing local hours in jumps is the deciding requirement, the documented NH34 function does not meet it. A blue/red bezel cannot settle that choice.

Compare the case span and measuring basis

The OCT025 lists 45.5 mm lug to lug, the OCT008 47 mm and the SN0109G 48.5 mm. So the 39 mm GMT is longer than the 39 mm three-hand OCT008.

The OCT008's 12.5 mm thickness explicitly includes glass. OCT025 sources disagree over whether their 11.2 mm figure includes glass. The Tudor sheets do not supply comparable watch thickness or lug-to-lug figures, so the tables leave those gaps open.

The OCT008 swaps the 79030N's aluminium bezel for ceramic. The OCT025 swaps the 54's black bezel for red. Neither change says anything about durability, finishing or comfort.

Against the original, spec by spec

A 37 mm automatic beside the Black Bay 54

The OCT025 and the Tudor 54 are both listed at 37 mm. This OCT025 has a red bezel and a PT5004. Whether its thickness includes the crystal is unclear.

Specification79000NOctopus Kraken OCT025
Case width37 mmTudor Black Bay 54 M79000N-0001 Reference Page | Tempus Europa37 mm
Lug to lug46 mmTudor Black Bay 54 M79000N-0001 Reference Page | Tempus Europa45.5 mm
Thickness11.24 mmTudor Black Bay 54 M79000N-0001 Reference Page | Tempus EuropaSources differ
Lug width20 mmTudor Black Bay 54 M79000N-0001 Reference Page | Tempus Europa20 mm
Movement typeNot listed yetautomatic
Movement calibreMT5400Tudor Black Bay 54 M79000N-0001 Reference Page | Tempus EuropaPT5004
Case materialNot listed yet316L stainless steel
CrystalNot listed yetSapphire with AR
Water resistance200 mTudor Black Bay 54 M79000N-0001 Reference Page | Tempus Europa200 m
BezelNot listed yetUnidirectional, aluminium/stainless steel according to option
Bracelet materialNot listed yetStainless steel
LumeNot listed yetSwiss Retro/BGW9, colour dependent
Power reserve70 hoursTudor Black Bay 54 M79000N-0001 Reference Page | Tempus EuropaNot listed yet
Water resistanceNot listed yet20 bar
WeightNot listed yet128 g
A 39 mm automatic beside the Black Bay 58

The OCT008 shares the 58's 39 mm and rivet-style bracelet. Its bezel is ceramic, not aluminium.

Specification79030NOctopus Kraken OCT008
Case width39 mmTudor Black Bay Fifty-Eight 79030N39 mm
Lug to lug47 mmTudor Black Bay Fifty-Eight47 mm
Thickness11.9 mmTudor Black Bay Fifty-Eight12.5 mm
Lug width20 mmTudor Black Bay Fifty-Eight20 mm
Movement typeNot listed yetautomatic
Movement calibreMT5402Tudor Black Bay Fifty-Eight 79030NPT5000
Case materialsteelTudor Black Bay Fifty-Eight 79030N316L stainless steel
Crystaldomed sapphireTudor Black Bay Fifty-Eight 79030NDomed sapphire with AR
Water resistance200 mTudor Black Bay Fifty-Eight 79030N200 m
Bezelunidirectional steel with black anodised aluminium discTudor Black Bay Fifty-Eight 79030NUnidirectional ceramic
Bracelet materialNot listed yet316L rivet bracelet
LumeNot listed yetSwiss BGW9
Power reserve70 hoursTudor Black Bay Fifty-Eight 79030NNot listed yet
WeightNot listed yet150 g
A 39 mm GMT beside the 41 mm 79830RB

The San Martin is smaller in nominal diameter than this Tudor GMT. The more important function difference is which hour hand you can adjust independently.

Specification79830RBSan Martin SN0109 GMT
Case width41 mmTudor Black Bay GMT M79830RB-0001 Reference Page | Tempus Europa39 mm
Lug to lug50 mmTudor Black Bay GMT M79830RB-0001 Reference Page | Tempus Europa48.5 mm
Thickness14.6 mmTudor Black Bay GMT M79830RB-0001 Reference Page | Tempus Europa13 mm
Lug width22 mmTudor Black Bay GMT M79830RB-0001 Reference Page | Tempus Europa20 mm
Movement typeNot listed yetautomatic GMT
Movement calibreMT5652Tudor Black Bay GMT M79830RB-0001 Reference Page | Tempus EuropaNH34
Case materialNot listed yet316L stainless steel
CrystalNot listed yetDomed sapphire, internal AR
Water resistance200 mTudor Black Bay GMT M79830RB-0001 Reference Page | Tempus Europa100 m
BezelNot listed yetAluminium blue/red 24-hour, 24-click bidirectional
ClaspNot listed yetOn-the-fly adjustable folding safety
FunctionsNot listed yetHours, minutes, seconds, GMT, date
Gmt behaviorNot listed yetIndependently adjustable 24-hour hand
LumeNot listed yetBGW9 blue
Power reserve70 hoursTudor Black Bay GMT M79830RB-0001 Reference Page | Tempus EuropaNot listed yet
WarrantyNot listed yet2 years
WeightNot listed yet148 g

Questions

Which shortlisted watch is 37 mm?

The OCT025 with black dial, red bezel and PT5004 is listed at 37 mm, the same as the Black Bay 54. Its seller lists 45.5 mm lug to lug; whether its thickness includes the crystal is unclear.

Does the SN0109G work like the Tudor Black Bay GMT?

Both provide a 24-hour GMT hand, but they set differently. The San Martin's NH34 adjusts that hand independently. Tudor's MT5652 adjusts the local hour in jumps, with the date following it. Do not buy the NH34 expecting that local-hour function.

Does the OCT008 use the same bezel material as the 79030N?

No. Octopus Kraken lists a ceramic rotating bezel. The official 79030N sheet lists a black anodised aluminium disc. The shared 39 mm diameter does not remove that material difference.

Can I compare the OCT025 thickness directly with the OCT008?

Not from these listings. OCT008's 12.5 mm includes glass. Both OCT025 pages give 11.2 mm, but the maker says including glass and the seller says without glass. We withhold the OCT025 value until the basis is clear.

Sources and dates

We used Tudor reference sheets to separate 54, 58, 41 mm and GMT specifications. Candidate figures come from the named brand or seller pages. TMI's NH34 manual supports the GMT setting comparison. Bewrist has not worn, measured or pressure-tested these watches.

The catalogue snapshot was checked on 4 October 2026 for exact version links and design-comparison scope. A reference chosen for a table does not by itself identify a candidate's exact design target.

The official figures here belong to the stated references and dated sheets. They do not describe every later Black Bay generation. There is no current price or stock comparison, independent water test, bracelet-comfort trial or reliability comparison.

Some buying links on watch pages are affiliate links. Bewrist may earn a commission when you use them.

  1. TUDOR Black Bay 54 press kit, reference 79000NMaker, read 4 October 2026
  2. TUDOR Black Bay Fifty-Eight press kit, reference 79030NMaker, read 4 October 2026
  3. TUDOR Black Bay GMT press kit, reference 79830RBMaker, read 4 October 2026
  4. TUDOR Black Bay GMT model familyMaker, read 4 October 2026
  5. Octopus Kraken OCT008 39 mm rivet-bracelet BB 58 homageMaker, read 4 October 2026
  6. Octopus Kraken OCT025 37 mm BB 54 homageMaker, read 4 October 2026
  7. OCT025 listing with selected colour optionsSeller, read 4 October 2026
  8. San Martin SN0109-G GMT product pageMaker, read 4 October 2026
  9. TMI NH34 product line-upMovement maker, read 4 October 2026
  10. TMI NH3 series operation manualMovement maker, read 4 October 2026
  11. Bewrist Black Bay catalogue snapshot, checked 4 October 2026Catalogue, read 4 October 2026
  12. TUDOR Black Bay press kit, reference 7941A 1A 0NUMaker, read 4 October 2026
  13. Catalogue observation: www.octopuskraken.comCatalogue, read 2 October 2026
  14. Catalogue observation: www.octopuskraken.comCatalogue, read 2 October 2026
  15. Catalogue observation: www.sanmartin.watchCatalogue, read 2 October 2026
The references, in order5 references, with the homages that follow each

Which Black Bay?

6 of the 20 homages follow one named reference, and the rest copy the look in general. Select a reference to see its homages.

Black Bay5 references

  1. 79030Black Bay Fifty-Eight39 mm1 homage
  2. 79470Black Bay Pro39 mm, MT56521 homage
  3. 79000NBlack Bay 5437 mm, MT54002 homages
  4. 79030NBlack Bay Fifty-Eight39 mm, MT54021 homage
  5. 79830RBBlack Bay GMT41 mm, MT56521 homage

Black Bay 41, 7941A1A0NU

The 2024 Black Bay 41 combines a 41 mm case with a black 60-minute bezel and MT5602-U. It is a three-hand diver, separate from the GMT.

Black Bay 54, 79000N

The checked Black Bay 54 is 37 mm and uses MT5400. Its bezel insert omits minute graduations.

Black Bay Fifty-Eight, 79030N

This Black Bay Fifty-Eight is 39 mm with MT5402 and a graduated black aluminium dive bezel. These are the 79030N specifications.

Black Bay GMT, 79830RB

The checked 41 mm Black Bay GMT adds a 24-hour hand and date. Its local hour jumps independently, with the date synchronized to that hand.

Compared and not kept6 watches left off the bench, with the reason

These watches were compared with the Tudor Black Bay and left off the bench.