Seiko Alpinist SPB121 vs Hamilton Khaki Field Auto
Both are field / explorer watches in the upper tier — here's how the specs differ and which to pick.
| Spec | Seiko Alpinist SPB121 | Hamilton Khaki Field Auto |
|---|---|---|
| Movement | Automatic | Automatic |
| Water resistance | 200m | 100m |
| Case size | 39.5mm | 42mm |
| Crystal | sapphire | sapphire |
| Style | Field / explorer | Field / explorer |
| Price tier | Upper | Upper |
Which should you buy?
- the Seiko Alpinist SPB121 takes more water (200m) — the one to pick if you actually swim or dive
- the Seiko Alpinist SPB121 wears 39.5mm vs the Hamilton Khaki Field Auto's 42mm — choose by wrist size
Where to buy
Check the Seiko Alpinist SPB121 price on Amazon →
Check the Hamilton Khaki Field Auto price on Amazon →
FAQ
What's the difference between the Seiko Alpinist SPB121 and the Hamilton Khaki Field Auto?
Both are field / explorer watches in the upper tier. The Seiko Alpinist SPB121 is automatic, 200m water resistance, 39.5mm, sapphire crystal; the Hamilton Khaki Field Auto is automatic, 100m water resistance, 42mm, sapphire crystal.
Which has better water resistance, the Seiko Alpinist SPB121 or the Hamilton Khaki Field Auto?
The Seiko Alpinist SPB121, rated 200m, versus 100m on the other. Pick 100m or higher for swimming and 200m+ for diving.
Which is better value, the Seiko Alpinist SPB121 or the Hamilton Khaki Field Auto?
Both sit in the upper tier, so it comes down to movement, water resistance and case size — see the spec table above.
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