Compare Studio
SARB017 vs SPB121
Differences are highlighted. Rows where both references share a value are dimmed.
| Specification | ||
|---|---|---|
| Production | 2006–2018 | 2020–present |
| Era | 6R15 JDM Alpinist | 6R35 Prospex Alpinist |
| Status | discontinued | current |
| Case diameter | 38mm | 39.5mm |
| Thickness | 12.5mm | 13.2mm |
| Lug width | 20mm | 20mm |
| Case material | Stainless steel | Stainless steel |
| Bezel | Internal rotating compass bezel, operated by the crown at 4 | Internal rotating compass bezel |
| Crystal | Sapphire, box-shaped | Sapphire |
| Crown | Screw-down crown at 3; secondary crown at 4 for the bezel | Screw-down crown at 3; secondary crown at 4 |
| Caseback | Screw-down, exhibition on later production | — |
| Water resistance | 200m | 200m |
| Dial | Green sunburst | Green sunburst |
| Hour markers | Applied gold-tone cathedral-adjacent markers | — |
| Hands | Gold-tone cathedral hands | Cathedral hands |
| Lume | LumiBrite | LumiBrite |
| Lume type | LumiBrite | LumiBrite |
| Movement | Automatic | Automatic |
| Caliber | 6R15 | 6R35 |
| Manufacturer | Seiko | Seiko |
| Winding | automatic | automatic |
| Power reserve | ~50 hours | ~70 hours |
| Frequency | 21,600 vph | — |
| Jewels | 23 | — |
| Complications | Date, hacking, hand-winding | Date, hacking, hand-winding |
| Strap options | Brown leather; steel bracelet on some markets | — |