Updated
Hamilton Khaki Field Auto vs Longines HydroConquest
Swiss field watch or Swiss dive watch
Quick Verdict
The Hamilton Khaki Field Automatic ($500–$1,000) is a 38mm Swiss field watch with sapphire, 100m and an 80-hour reserve. The Longines HydroConquest ($1,500–$2,500) is a 41mm Swiss diver with sapphire, 300m, a ceramic bezel and a 72-hour reserve with a silicon balance spring. The Hamilton is the cheaper everyday watch; the Longines is the more capable diver.
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Specifications Compared
| Feature | Hamilton Khaki Field Automatic | Longines HydroConquest Automatic |
|---|---|---|
| Price | $500–$1,000 | $1,500–$2,500 |
| Case Size | 38mm | 41mm |
| Movement | Automatic H-10 | Automatic L888.5 |
| Caliber Type | Automatic (ETA C07.611 base) | ETA-Based Automatic with Silicon Balance Spring |
| Power Reserve | 80 Hours | 72 Hours |
| Water Resistance | 100m (10 ATM) | 300m (30 ATM) |
| Crystal | Sapphire Crystal | Sapphire with Anti-Reflective Coating |
| Case Material | Stainless Steel | Stainless Steel |
| Origin | Swiss Made | Swiss Made |
Category-by-Category Analysis
Design & Aesthetics
Military field dial against a modern diver
The Khaki Field is a military-style field watch with a 24-hour inner ring and a highly legible dial. The HydroConquest is a modern diver with a ceramic bezel. One is understated and utilitarian, the other sporty and polished.
Movement & Performance
H-10 against L888.5
The Hamilton runs the H-10 automatic (ETA C07.611 base), 25 jewels at 21,600 vph, with an 80-hour reserve. The Longines runs the L888.5 automatic, 21 jewels at 25,200 vph, with a 72-hour reserve and a silicon balance spring, which resists magnetism. The Hamilton has the longer reserve; the Longines has the more modern hairspring.
Durability & Water Resistance
300m against 100m
Both use sapphire crystals; the Longines adds an anti-reflective coating. The HydroConquest is rated to 300m (30 ATM) and the Khaki Field Auto to 100m (10 ATM). For diving, the Longines is the clear choice.
Wearability & Fit
The Hamilton is 3mm smaller
The Khaki Field Auto is 38mm and the HydroConquest is 41mm. The Hamilton suits small and medium wrists especially well. The Longines is a standard modern diver size.
Value & Cost of Ownership
The Hamilton is two bands cheaper
The Khaki Field Auto sits in the $500–$1,000 band and the HydroConquest in $1,500–$2,500. Both are Swiss automatics that will want occasional servicing. If you do not need 300m, the Hamilton gives you most of what matters for less.
Materials Face-Off
| Component | Hamilton Khaki Field Automatic | Longines HydroConquest Automatic |
|---|---|---|
| Case | Stainless steel, brushed finish. Hamilton does not publish the alloy grade for this reference. | Zirconium oxide (ZrO₂) with engraved and paint-filled 60-minute dive scale Mohs 8.5 |
| Crystal | Verneuil-grown sapphire, single-side AR coating. | Flat sapphire with anti-reflective coating on the underside 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. | Si hairspring in the L888.5 caliber — introduced 2020 across the HydroConquest line |
| Strap | Full-grain leather (varies by reference). | Brushed flanks with polished bevel edges — mixed finishing for visual depth |
| Super-LumiNova | — | Applied to sword-style hands and all hour indices |
Cost of Ownership Compared
The Hamilton Khaki Field Automatic saves you $1,000–$1,500 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 Longines HydroConquest Automatic if…
- Best-in-class 72-hour power reserve at sub-$2,000
- Silicon hairspring antimagnetic protection at an accessible price
- Swiss heritage enthusiasts — Longines' 1832 founding and Olympic/aviation history
- Legitimate 300m dive capability with everyday wearability
- Value seekers — at grey-market pricing the spec-per-dollar is nearly unbeatable
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)
Longines HydroConquest Automatic
- ETA-base movement at this price — excellent but not "in-house" in the purist sense
- 21mm lug width — awkward for aftermarket straps (most are 20mm or 22mm)
- 25,200 vph (3.5 Hz) — seconds hand sweep is less smooth than 28,800 vph competitors
- Not COSC-certified — no chronometer guarantee (unlike Tudor or Omega at similar prices)
Our Verdict
Hamilton
Khaki Field Automatic
Choose the Hamilton Khaki Field Auto if you want a compact, legible everyday watch. At 38mm it fits almost any wrist, it has an 80-hour reserve and sapphire, and 100m is enough for swimming. It costs much less than the Longines.
Check Price on AmazonLongines
HydroConquest Automatic
Choose the Longines HydroConquest if you want a proper Swiss dive watch. 300m, a ceramic unidirectional bezel and a silicon balance spring give it the stronger specification, and the 41mm case still wears reasonably.
Check Price on AmazonThe Bottom Line
The Hamilton Khaki Field Automatic is a 38mm Swiss field watch with a sapphire crystal, 100m water resistance and an 80-hour power reserve, while the Longines HydroConquest is a 41mm Swiss dive watch with a ceramic bezel, 300m water resistance and a 72-hour power reserve with a silicon balance spring, priced two bands higher.
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.