Seiko Sumo homages
2 homages of the Seiko Sumo, each drawn to scale beside it with price, movement and size.
45 mm across2 homages
See two to start with
How to recognise one
Six marks make the look. The count says how many of the 2 homages keep each one.
Rotating dive bezel
A black bezel with a lume pip at 12 and numerals every ten minutes.
Triangle at 12
A lumed triangle at 12 points to the centre of the dial.
Round hour plots
Lumed circles mark most of the hours.
Date at 3
A small date window sits at 3 beside a lume bar.
Crown at 4
The crown sits low, at 4, rather than at 3.
Broad lumed hands
The hour and minute hands are wide and filled with lume.
Each close-up covers about 12.5 mm of watch, using the listed case width and estimated photo edges.
Two to start with
Picked from the record by marks kept, price and size, each sold under its own maker's name, not as a Seiko.
Addiesdive MY-H10
about £104 $139, seen 2 Oct44.5 mm
Lowest price. The lowest price listed here.
Steeldive SD1971
44.9 mm
44.9 mm across, NH35.
Price not listed yet
Original specifications
Sizes and specifications apply to the version named below. Other versions can differ.
Prospex Sumo model scopeShown in the photograph
explicit model alias; 6R35 third-generation reference
| Specification | Value | Sources and notes |
|---|---|---|
| Case width | 45 mm | Prospex Sumo SPB101J1 technical sheet | Seiko Boutique UKProspex Sumo SPB101 | bezelga Sources agree. Seiko Boutique technical sheet and independent bezelga page agree; bezelga cites Seiko Germany source specifications. |
| Lug to lug | 52.6 mm | Prospex Sumo SPB101 | bezelga One cited source. bezelga explicitly identifies 52.6 mm lug-to-lug; Seiko labels 52.6 mm case length. |
| Thickness | 12.9 mm | Prospex Sumo SPB101J1 technical sheet | Seiko Boutique UKProspex Sumo SPB101 | bezelga Sources agree. Seiko Boutique technical sheet and independent bezelga page agree; bezelga cites Seiko Germany source specifications. |
| Lug width | 20 mm | Prospex Sumo SPB101J1 technical sheet | Seiko Boutique UKProspex Sumo SPB101 | bezelga Sources agree. Seiko Boutique technical sheet and independent bezelga page agree; bezelga cites Seiko Germany source specifications. |
| Movement calibre | Not confirmed | No sourced value selected for this scope. |
| Crystal | Not confirmed | No sourced value selected for this scope. |
| Water resistance | 200 m | Prospex Sumo SPB101J1 technical sheet | Seiko Boutique UK One cited source. Single successful page body supports this candidate-scoped value. |
| Case length | 52.6 mm | Prospex Sumo SPB101J1 technical sheet | Seiko Boutique UK One cited source. Single successful technical-sheet body supports case length, not a confirmed lug-to-lug measurement. |
| Power reserve | 70 hours | Prospex Sumo SPB101J1 technical sheet | Seiko Boutique UK One cited source. Single successful page body supports this candidate-scoped value. |
Sources and unconfirmed details
- Prospex Sumo SPB101J1 technical sheet | Seiko Boutique UK, read 2026-10-07T07:53:21Z
- Prospex Sumo SPB101 | bezelga, read 2026-10-07T08:40:00Z
More about the Sumo
Lay a homage over the SeikoAny of the 2, laid over the original at one scale
Lay a homage over the Seiko
Slide to fade from one watch to the other and compare the case shapes. The figures below describe the version shown in the photograph.
45Seiko Sumo
44.5Addiesdive MY-H10
44.9Steeldive SD1971Photos 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.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.
Seiko Sumo photo: SPB101J1. Addiesdive MY-H10 photo: MY-H10 green Sumo, steel bracelet.44.9 mm, 0.1 mm narrower than the Seiko
Seiko Sumo photo: SPB101J1. Steeldive SD1971 photo: SD1971 Sumo style, black dial, steel bracelet.
Prospex Sumo model scope, specifications and sources
| Measure | Seiko | Addiesdive MY-H10 |
|---|---|---|
| Case width | 45 mm | 44.5 mm |
| Lug to lug | 52.6 mm | Not listed yet |
| Thickness | 12.9 mm | 14.5 mm |
| Lug width | 20 mm | 20 mm |
| Movement | Not listed yet | Not listed yet |
| Power reserve | 70 hours | Not listed yet |
| Water | 200 m | 200 m |
| Price | Not tracked here | about £104 $139, seen 2 Oct |
Side view
Copies
Not compared yet
Gives it away
No difference noted