Hamilton Khaki Field Automatic vs Mido Ocean Star GMT
Hamilton's field watch meets Mido's diver
Quick Verdict
The Hamilton Khaki Field Automatic ($500–$1,000) offers Automatic (ETA C07.611 base) precision in the tier below the Mido Ocean Star GMT ($1,000–$1,500). The Khaki Field Automatic measures 38mm and is rated 100m (10 ATM). The Ocean Star GMT counters with Swiss Made craftsmanship and 200m (20 ATM) water resistance. Both are exceptional watches for their respective tiers.
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Specifications Compared
| Feature | Hamilton Khaki Field Automatic | Mido Ocean Star GMT |
|---|---|---|
| Price | $500–$1,000 | $1,000–$1,500 |
| Case Size | 38mm | 44mm |
| Movement | Automatic H-10 | Automatic Caliber 80 (Base ETA C07.661) |
| Caliber Type | Automatic (ETA C07.611 base) | Automatic (ETA C07.661 base) |
| Power Reserve | 80 Hours | 80 Hours |
| Water Resistance | 100m (10 ATM) | 200m (20 ATM) |
| Crystal | Sapphire Crystal | Sapphire with Double-sided AR |
| Case Material | Stainless Steel | Stainless Steel |
| Origin | Swiss Made | Swiss Made |
Category-by-Category Analysis
Design & Aesthetics
Hamilton's design language vs Mido's approach
The Hamilton Khaki Field Automatic features a Stainless Steel case at 38mm with Sapphire Crystal protection. The Mido Ocean Star GMT offers Stainless Steel construction at 44mm with Sapphire with Double-sided AR. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Automatic H-10 vs Automatic Caliber 80 (Base ETA C07.661)
The Khaki Field Automatic runs the Automatic H-10 (Automatic (ETA C07.611 base), 80 Hours power reserve) at 21,600 vph (3 Hz) frequency. The Ocean Star GMT uses the Automatic Caliber 80 (Base ETA C07.661) (Automatic (ETA C07.661 base), 80 Hours reserve) at 21,600 vph (3 Hz). Power reserves are closely matched.
Wearability & Fit
38mm vs 44mm — different wrist presence
At 38mm, the Khaki Field Automatic wears more compactly on smaller wrists compared to the Ocean Star GMT at 44mm. Water resistance differs: 100m (10 ATM) vs 200m (20 ATM).
Value & Cost of Ownership
Hamilton sits in the lower tier
The Hamilton Khaki Field Automatic sits at $500–$1,000 and the Mido Ocean Star GMT at $1,000–$1,500. On the specs that outlast any price: the Khaki Field Automatic uses Sapphire Crystal with 80 Hours, against Sapphire with Double-sided AR and 80 Hours on the Ocean Star GMT. Service intervals are typically 5-7 years for both.
Water Resistance
100m (10 ATM) vs 200m (20 ATM)
The Khaki Field Automatic is rated to 100m (10 ATM) while the Ocean Star GMT handles 200m (20 ATM). The Ocean Star GMT offers superior water resistance.
Materials Face-Off
| Component | Hamilton Khaki Field Automatic | Mido Ocean Star GMT |
|---|---|---|
| Case | Stainless steel, brushed finish. Hamilton does not publish the alloy grade for this reference. | Stainless steel 316L |
| Crystal | Verneuil-grown sapphire, single-side AR coating. | Synthetic sapphire grown via Verneuil process, Mohs 9. Double-sided AR coating — uncommon at this price tier, provides exceptionally clear dial readi Mohs 9 |
| Lume | Super-LumiNova on the hands and hour numerals. Hamilton lists "Super Luminova: Yes" for this reference and does not publish a grade, so none is claimed here. | Ceramic (ZrO₂) — scratchproof, color-stable. Engraved 24-hour scale |
| Strap | Full-grain leather (varies by reference). | Super-LumiNova (variant-dependent grade) |
| Bracelet alloy | — | Stainless steel 316L |
Cost of Ownership Compared
The Hamilton Khaki Field Automatic saves you $722 over 5 years of ownership
Who Should Pick Which
Pick the Hamilton Khaki Field Automatic if…
- Strong value proposition under $1,000 with quality construction
- Active lifestyle wearers — 100m water resistance handles swimming and water sports
- Weekend warriors — 80-hour power reserve means it survives two days off the wrist
- Those who prioritize scratch resistance — sapphire crystal
- Military/field watch enthusiasts who value legibility and durability
Pick the Mido Ocean Star GMT if…
- Enthusiasts wanting proven Swiss/Japanese quality in the $1,000–$2,000 sweet spot
- Dive watch enthusiasts — 200m water resistance is proper dive spec
- Weekend warriors — 80-hour power reserve means it survives two days off the wrist
- Those who prioritize scratch resistance — sapphire crystal
- Dive watch collectors who appreciate proper ISO-rated tool watches
Hamilton Khaki Field Automatic
- Same H-10 / C07 movement as Tissot PRX and Mido — paying brand premium for the Hamilton heritage
- 3 Hz "slow" seconds beat (visible 6 ticks/sec vs. 8)
- Strap quality is adequate, not exceptional
- No hacking, but movement is auto-only (no hand-wind on the 80h variant — older H-30 caliber refs had it)
Mido Ocean Star GMT
- 44mm wears large — too big for under-7" wrists
- ETA base movement at this price — fair value but not in-house prestige
- Crystal AR coating can show fingerprints — double-sided AR is a quality upgrade but requires more frequent wipe-downs
- Bracelet quality is adequate not exceptional — most owners report the bracelet is the watch's weak point; aftermarket rubber/MN straps significantly upgrade daily wear
Our Verdict
Hamilton
Khaki Field Automatic
Choose the Hamilton Khaki Field Automatic if you prioritize Automatic (ETA C07.611 base) engineering, Swiss Made craftsmanship, and 100m (10 ATM) water resistance. At $500–$1,000, it delivers Automatic H-10 with 80 Hours power reserve.
Check Price on AmazonMido
Ocean Star GMT
Choose the Mido Ocean Star GMT if you value Automatic (ETA C07.661 base) technology, Swiss Made heritage, and 44mm proportions. At $1,000–$1,500, the Automatic Caliber 80 (Base ETA C07.661) with 80 Hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Hamilton Khaki Field Automatic and Mido Ocean Star GMT represent two distinct approaches to fine watchmaking — the Hamilton bringing Swiss Made tradition while Mido delivers Swiss Made engineering.
Frequently Asked Questions
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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.