BewristHomage watches, measured
San Martin SN0138 BB54 diver, SN0138G black dial, black bezel, gilt scale
SN0138 BB54 diver, SN0138G black dial, black bezel, gilt scale

San Martin SN0138 BB54 diver

A homage of the Tudor Black Bay

Price not listed yet

Size
37 mm across, 2 mm narrower than the Tudor
Movement
ST2130, automatic. Sapphire crystal
Look
Not compared mark by mark yet
Gives it away
2 mm narrower than the Tudor, 37 mm against 39 mm
Compare with another homage

Against the Tudor

Tudor Black Bay M79030B-000139Tudor Black Bay M79030B-0001
San Martin SN0138 BB54 diver37San Martin SN0138 BB54 diver

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.

37 mm, 2 mm narrower than the Tudor
Tudor Black Bay M79030B-0001 photo: M79030B-0001. San Martin SN0138 BB54 diver photo: SN0138G black dial, black bezel, gilt scale.

The Tudor drawn is the M79030B-0001.

What gives it away

  • 2 mm narrower than the Tudor, 37 mm against 39 mm

  • Snowflake hour hand

    Not compared yet.

  • Triangle at 12

    Not compared yet.

  • Round hour plots

    Not compared yet.

  • Bars at 3, 6 and 9

    Not compared yet.

  • Coin-edge dive bezel

    Not compared yet.

  • Large crown

    Not compared yet.

Tudor left, SN0138 BB54 diver right.

Everything else

Every spec13 listed, each with where it came from

Every spec we have

From sellers. Each figure links to where it was found.

Case width
37 mmsanmartin-watch.com, 2 Oct
Lug to lug
45.8 mmsanmartin-watch.com, 2 Oct
Thickness
12.7 mmsanmartin-watch.com, 2 Oct
Lug width
20 mmsanmartin-watch.com, 2 Oct
Movement type
Automatic high beatsanmartin-watch.com, 2 Oct
Movement calibre
ST2130sanmartin-watch.com, 2 Oct
Case material
316L stainless steelsanmartin-watch.com, 2 Oct
Crystal
Sapphire, AR coatingsanmartin-watch.com, 2 Oct
Water resistance
200 msanmartin-watch.com, 2 Oct
Bezel
Bead-blasted aluminium, 120-click unidirectionalsanmartin-watch.com, 2 Oct
Clasp
On-the-fly adjustablesanmartin-watch.com, 2 Oct
Warranty
2 yearssanmartin-watch.com, 2 Oct
Weight
147 gsanmartin-watch.com, 2 Oct
The movementST2130, in plain words

The movement, in plain words

San Martin lists the ST2130 for the SN0138 BB54 diver. It is an automatic, so wearing it winds it.

On your wrist37 mm across, 12.7 mm thick, on a wrist your size

How it sits on your wrist

Set your wrist circumference to compare the 37 mm case with a schematic wrist. The ellipse estimates wrist width and shape. It cannot predict your fit.

17.0 cm6.7 in around

This wrist model is about 56 mm across. The case spans 66% of that estimated width. The lug span ends 5.2 mm inside each model edge.

Wrap a strip of paper round your wrist just below the bone, mark where it meets and measure it.

37 mm case 45.8 mm lug to lug Wrist model about 56 mm across
Schematic section, with a 10 mm grid. The ellipse approximates wrist anatomy from circumference. Your wrist shape, lug curve and fit will differ.

How tall it stands

12.7 37 wide 45.8 lug to lug

The side view uses listed dimensions. Case shape and lug curve are schematic.

Side views to scale against other Tudor Black Bay homages.

  1. Cronos L602512.1 mm
  2. Cronos L602612.1 mm
  3. San Martin SN0138 BB54 diver12.7 mm
  4. Aquatico Bronze Sea Star14 mm
  5. Cronos L601714.05 mm
  6. Cronos L602214.2 mm
  7. Cronos L602114.45 mm
More from San Martin4 more on Bewrist

Every San Martin watch

Beside other Tudor Black Bay homagesThis watch and 5 more of its look, to scale

Drawn to scale by listed case width.

All 20 on the look page

SourcesThe 2 pages this record was built from