Updated
Hamilton Khaki Field Auto vs Seiko Alpinist
Swiss field watch or Japanese explorer
Quick Verdict
The Hamilton Khaki Field Automatic and the Seiko Alpinist SPB210 both sit in the $500–$1,000 band with sapphire crystals and a date. The Hamilton is 38mm with an 80-hour reserve and 100m. The Alpinist is 39.5mm with a 70-hour reserve, 200m and an inner compass bezel. The Hamilton is the simpler field watch; the Alpinist is the more water-capable explorer.
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Specifications Compared
| Feature | Hamilton Khaki Field Automatic | Seiko Prospex Alpinist |
|---|---|---|
| Price | $500–$1,000 | $500–$1,000 |
| Case Size | 38mm | 39.5mm |
| Movement | Automatic H-10 | Automatic Caliber 6R35 |
| Caliber Type | Automatic (ETA C07.611 base) | In-House Automatic Manufacture |
| Power Reserve | 80 Hours | 70 Hours |
| Water Resistance | 100m (10 ATM) | 200m (20 ATM) |
| Crystal | Sapphire Crystal | Sapphire with Cyclops |
| Case Material | Stainless Steel | Stainless Steel |
| Origin | Swiss Made | Made in Japan |
Category-by-Category Analysis
Design & Aesthetics
Military field dial against sunburst explorer
The Khaki Field is a military-style field watch with a 24-hour inner ring. The Alpinist has a sunburst dial and an inner compass bezel. The Hamilton is quieter; the Alpinist is more eye-catching.
Movement & Performance
80 hours against 70
The Hamilton runs the Swiss H-10 (ETA C07.611 base), 25 jewels, 80-hour reserve. The Alpinist runs Seiko's in-house 6R35, 24 jewels, 70-hour reserve. Both run at 21,600 vph. Both will survive a weekend off the wrist.
Durability & Water Resistance
200m against 100m
Both have sapphire crystals; the Alpinist adds a cyclops. The Alpinist is rated to 200m (20 ATM), the Hamilton to 100m (10 ATM). Both are fine for swimming, but the Alpinist has more margin.
Wearability & Fit
Within 1.5mm
The Hamilton is 38mm and the Alpinist 39.5mm. Both are versatile mid-sizes; the Hamilton is slightly smaller.
Value & Cost of Ownership
Same band
Both sit in the $500–$1,000 band. Each gives sapphire, a long reserve and a date. Choose on style and water needs.
Our Verdict
Hamilton
Khaki Field Automatic
Choose the Hamilton Khaki Field Auto if you want a classic, legible field watch with the longer reserve. It is Swiss made, slightly smaller, and the more understated of the two.
Check Price on AmazonSeiko
Prospex Alpinist
Choose the Seiko Alpinist if you want more water resistance and a dial with more character. 200m, an inner compass bezel and Seiko's in-house 6R35 make it the more versatile outdoor watch.
Check Price on AmazonThe Bottom Line
The Hamilton Khaki Field Automatic and the Seiko Prospex Alpinist SPB210 are both sapphire-crystal automatics in the $500 to $1,000 band; the Hamilton is 38mm with an 80-hour reserve and 100m, while the Alpinist is 39.5mm with a 70-hour reserve, 200m and an inner rotating compass bezel.
Frequently Asked Questions
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How This Page Was Made
Our comparisons are generated from a hand-maintained specification database and reviewed under our editorial standards. We use AI tools to assemble pages from that data. We don’t invent specs: every number traces back to the database, and when we correct an entry, the fix is applied site-wide. As an Amazon Associate, The Horologist earns from qualifying purchases.