Seiko Prospex Alpinist SPB317J1
Best for: The tough half of the pair
9.6/10
Keep Score
- Crystal
- 2.5/2.5
- Serviceability
- 2.5/2.5
- Water resistance
- 1.5/1.5
- Warranty
- 1.05/1.5
- Strap standard
- 1/1
- Cost-to-keep transparency
- 1/1
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200m with sapphire in a 41mm case at 46.9mm lug-to-lug — this is the watch that takes the pool, the rain, the garden and the airport, so the other one never has to.
The Alpinist reads as a field watch, which means the pair does not end up looking like two divers. 20mm lugs take any strap.
It is the expensive half. If the budget only stretches once, spend it here rather than on the dress watch.
This is where Seiko starts publishing an accuracy figure (+25/-15 seconds a day) and fits sapphire. A 6R35 overhaul is $296 against $176 for a 4R36 — a real difference, and one you can plan for.
| Movement | Seiko 6R35, automatic with manual winding, 24 jewels, +25/-15 sec per day |
|---|---|
| Power reserve | 70 hours |
| Case | 41mm stainless steel |
| Lug-to-lug | 46.9mm |
| Thickness | 12.3mm |
| Lug width | 20mm |
| Crystal | sapphire |
| Water resistance | 200m |
| Warranty | 3 years |
Specifications read from Seiko Watch Corporation product page, SPB317J1.






