Seiko Alpinist SPB121 vs Seiko Prospex SPB143
Specifications
Marked rows differ| Case | ||
| Case diameter | 39.5 mm | 40.5 mm |
|---|---|---|
| Thickness | — | 13.2 mm |
| Lug-to-lug | — | 47.6 mm |
| Water resistance | 200 m | 200 m |
| Movement | ||
| Movement | automatic | Automatic (mechanical self-winding, with hand-winding and hacking seconds) |
| Caliber | 6R35 | Seiko 6R35 |
| Price | ||
| Launch MSRP | $725 | $1,200 |
| Details | ||
| Beat rate hz | — | 3 |
| Bezel | — | 120-click unidirectional rotating, brushed steel with white markings and lumed pip |
| Bracelet | — | Stainless steel three-link bracelet, 20mm at lugs tapering to 18mm, with three-fold clasp |
| Case material | — | Stainless steel with super-hard coating |
| Crystal | sapphire | Domed sapphire with anti-reflective coating |
| Dial color | — | Charcoal grey with subtle sunburst finish |
| Lug width mm | — | 20 |
| Lume | Lumibrite | LumiBrite |
| Power reserve hours | — | 70 |
Sources
Verified · 2 referencesEvery spec on this page was independently checked against the sources below before publishing.