Seiko Prospex Alpinist vs Hamilton Khaki Field Mechanical 38mm
The Hamilton Khaki Field Mechanical 38mm has a 0.6 mm longer lug-to-lug than the Seiko Prospex Alpinist (47 mm vs 46.4 mm).
The Seiko Prospex Alpinist has a 1.5 mm larger case than the Hamilton Khaki Field Mechanical 38mm (39.5 mm vs 38 mm).
The Seiko Prospex Alpinist has a 3.2 mm thicker case than the Hamilton Khaki Field Mechanical 38mm (12.7 mm vs 9.5 mm).
Both suit the same wrists on our fit model (6.5"–7.75").
They share a 20 mm lug width, so straps swap between them.
At US retail the Seiko Prospex Alpinist costs $225 more ($900 vs $675).
On your wrist
Seiko Prospex AlpinistIdeal fit
Hamilton Khaki Field Mechanical 38mmIdeal fit
Side by side
| Seiko Prospex Alpinist | Hamilton Khaki Field Mechanical 38mm | |
|---|---|---|
| Reference | SPB507 | H69439931 |
| Case diameter | 39.5 mm | 38 mm |
| Lug-to-lug | 46.4 mm | 47 mm |
| Thickness | 12.7 mm | 9.5 mm |
| Lug width | 20 mm | 20 mm |
| Water resistance | 200 m | 50 m |
| Movement | Seiko 6R55 (automatic) | Hamilton H-50 (manual) |
| Power reserve | 72 hours | 80 hours |
| Crystal | sapphire (magnifier) | sapphire |
| Style | Field, Sport | Field |
| Retail (US) | $900 | $675 |