AddiesdiveAD2103
Homage to the Seiko Prospex Monster
about$159
Regular price at addiesdivewatches.com, checked 31 Oct 2026. Marketplace prices change often.
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The Addiesdive AD2103 is a homage to the Seiko Prospex Monster, with a 42 mm case, 0.4 mm smaller. It uses an automatic movement and is water resistant to 200 m. Its Resemblance Score is 65 out of 100. It costs about $159 at the official store.
Side by side with the original
Compared with reference SRPD25. Values marked ≈ are estimates, such as a reviewer's measurement.
| Spec | AD2103 | Monster (SRPD25) | Difference |
|---|---|---|---|
| Case diameter | 42 mm | 42.4 mm | −0.4 mm |
| Lug-to-lug | 47.5 mm | 49.4 mm | −1.9 mm |
| Thickness | 13.7 mm | 13.4 mm | +0.3 mm |
| Lug width | 20 mm | 20 mm | same |
| Water resistance | 200 m | 200 m | |
| Movement | Automatic, 8N24 | Automatic, 4R36 | |
| Power reserve | Not published | 41 h | |
| Crystal | Sapphire | Mineral, cyclops | |
| Bezel | Unidirectional rotating bezel | Unidirectional rotating | |
| Case material | 316L stainless steel | Stainless steel | |
| Lume | C3 green lume | LumiBrite on hands and index(es) | |
| Bracelet | Steel bracelet | Stainless steel bracelet | |
| Weight | 188.5 g | 186 g |
The original
Seiko
Monster
Reference SRPD25, prospex automatic diver 200 m, blue dial, steel bracelet
- Case
- 42.4 mm
- Lug-to-lug
- 49.4 mm
- Thickness
- 13.4 mm
- Water resistance
- 200 m
- Movement
- Automatic, 4R36
- List price
- Not published
Why it scores 65
Proportions and movement are computed from specs. Design details and functions are judged from the brand's official images. How we score
Proportions22.1 / 30
- Case diameter10.4 / 120.4 mm apart
- Lug-to-lug2.3 / 81.9 mm apart
- Thickness5.4 / 60.3 mm apart
- Lug width4 / 4Same size
Design signatures22.5 / 40
- Sunken bezel assembly set below the lug tops, with a shroud that extends from the lugs11 / 11Bezel and case form a protective shroud that runs down from the lugs, with the bezel set low.
- Large arrow-tipped hour hand with arrow-tipped minute and seconds hands4 / 8Arrow-shaped lume hands over a skeleton dial; hand shapes are hard to compare.
- Large rectangular hour markers with a shark-tooth style marker at 120 / 7Large triangular lume wedges around a skeleton dial instead of rectangular markers with a shark-tooth 12.
- Bracelet with solid 20 mm end links that widen straight to 22 mm2.5 / 5Steel bracelet offered; the end-link shape is not clear in the official images.
- Day-date window at 3 o'clock under a cyclops magnifier0 / 4No date window and no cyclops.
- Screw-down crown at 4 o'clock3 / 3Screw-down crown at 4.
- Short, stubby lugs2 / 2Short, stubby lugs.
Functions and materials10 / 20
- Complications0 / 8Time with sweep seconds, no date or day; the original shows day and date.
- Bezel action4 / 4Unidirectional rotating bezel; the original is also unidirectional.
- Case and bezel materials4 / 4316L steel case, as on the original.
- Crystal shape and date window2 / 4Sapphire with no cyclops; the original has a mineral crystal under a cyclops.
Movement type10 / 10
- Movement type10 / 10Same movement type.
What reviewers and owners say
We haven't read enough independent reviews of this model to summarise them yet.
Good
- Open dial showing a Miyota 21-jewel movement
- Shrouded case with a short lug to lug
- Strong green lume on the dial wedges
- Three dial colours
Less good
- No date
- Triangular wedges instead of the original's rectangular markers
Versions and colours
- Orange dialIts own colourway, not on the originalabout $159
- Black dialIts own colourway, not on the originalabout $159
- Red dialIts own colourway, not on the originalabout $159
Compare
Sources
Checked 31 Oct 2026. Every figure on this page comes from one of these pages.