Seiko Monster homages
2 homages of the Seiko Monster, each drawn to scale beside it with price, movement and size.
42.4 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.
Notched dive bezel
A black bezel with deep notches around its edge and bold numerals.
Arrowhead marker at 12
A downward-pointing lumed marker with a split centre sits at 12.
Lumed bar plots
Broad lumed bars with a dark outline mark most hours.
Day and date at 3
A window at 3 shows the day and the date.
Crown at 4
The crown sits low, at 4, rather than at 3.
Arrowhead hands
The hour hand ends in a lumed arrowhead.
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.
Sea Knight SK01
about £144 €167, seen 2 Oct41.6 mm
Lowest price. The lowest price listed here.
Heimdallr Ocean Monster V2
Hangzhou 2553A.
Price and size not listed yet
Original specifications
Sizes and specifications apply to the version named below. Other versions can differ.
SRPD25Shown in the photograph
SRPD25 is a candidate comparator for the supplied Monster label. It does not define every generation or size in the family.
| Specification | Value | Sources and notes |
|---|---|---|
| Case width | 42.4 mm | SRPD25 | Seiko Watch Corporation Singapore One primary source. One readable model-specific publisher supports this value; scoped to this candidate only. |
| Lug to lug | 49.4 mm | SRPD25 | Seiko Watch Corporation Singapore One primary source. One readable model-specific publisher supports this value; scoped to this candidate only. |
| Thickness | 13.4 mm | SRPD25 | Seiko Watch Corporation Singapore One primary source. One readable model-specific publisher supports this value; scoped to this candidate only. |
| Lug width | 20 mm | SRPD25 | Seiko Watch Corporation Singapore One primary source. One readable model-specific publisher supports this value; scoped to this candidate only. |
| Case length | Not confirmed | No sourced value selected for this scope. |
Sources and unconfirmed details
- SRPD25 | Seiko Watch Corporation Singapore, read 2026-10-07T08:02:00Z
- SRPD25 | Seiko, read 2026-10-07T08:55:00Z
More about the Monster
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.
42.4Seiko Monster
40 mm placeholderHeimdallr Ocean Monster V2
41.6Sea Knight SK01Width unknown for one or both watches. The 40 mm placeholder does not show their true relative size. 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 Monster photo: SRPD25. Heimdallr Ocean Monster V2 photo: Ocean Monster V2 Frost Blue, steel bracelet.41.6 mm, 0.8 mm narrower than the Seiko
Seiko Monster photo: SRPD25. Sea Knight SK01 photo: red · day/date 3 · steel.
SRPD25, specifications and sources
| Measure | Seiko | Sea Knight SK01 |
|---|---|---|
| Case width | 42.4 mm | 41.6 mm |
| Lug to lug | 49.4 mm | Not listed yet |
| Thickness | 13.4 mm | 13.6 mm |
| Lug width | 20 mm | 20 mm |
| Movement | Not listed yet | NH36 |
| Power reserve | Not listed yet | Not listed yet |
| Water | Not listed yet | Not listed yet |
| Price | Not tracked here | about £144 €167, seen 2 Oct |
Side view
Copies
Not compared yet
Gives it away
No difference noted