Image not available$849
1 retailer
Prospex 42mm Samurai Automatic Diver
The Seiko Prospex 42mm Samurai Automatic Diver is a 41.7 mm, 200 m water-resistant automatic dive watch with a mineral crystal.
- Case
- 41.7 mm
- Water
- 200 m (656 ft)
- Movement
- Automatic
- Thickness
- 12.3 mm
Image not availableWhat the data says
- Heavier than most watches its size: 93% of 29 comparable watches weigh less.
- Lowest in-stock price is 11% below list price this week.
Computed from the specs below. How we write summaries.
Full specs
Last verified Oct 5, 2026
Seiko’s own site doesn’t allow automated reading, so specs, prices and photos come from Long Island Watch’s product page (longislandwatch.com), a retailer that sells it. Unless marked otherwise, every spec is quoted from that page.
| Case diameter | 41.7 mm |
|---|---|
| Thickness | 12.3 mm |
| Lug to lug | 49.5 mm |
| Lug width | 20 mm |
| Weight (manufacturer) | 0.37 lb (170 g) |
| Case | Stainless steel |
| Crystal | Mineral |
| Strap | Stainless steel bracelet, three-fold clasp with secure lock, push button release with extender |
| Water resistance | 200 m (656 ft) |
|---|
| Movement | Automatic |
|---|---|
| Caliber | Seiko 23-Jewel 4R35 |
| Style | Dive |
| Colorways | Black Dial, Red Dial, Blue Dial |
|---|---|
| Built for | Diving |
| Warranty | 3 Years |
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