Hamilton Khaki Field Automatic vs Zenith Chronomaster El Primero
Hamilton's field watch meets Zenith's chronograph
Quick Verdict
The Hamilton Khaki Field Automatic ($500–$1,000) offers Automatic (ETA C07.611 base) precision in the tier below the Zenith Chronomaster El Primero ($5,000–$10,000). The Khaki Field Automatic measures 38mm and is rated 100m (10 ATM). The Chronomaster El Primero counters with Swiss Made craftsmanship and 50m (5 ATM) water resistance. Both are exceptional watches for their respective tiers.
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Specifications Compared
| Feature | Hamilton Khaki Field Automatic | Zenith Chronomaster El Primero |
|---|---|---|
| Price | $500–$1,000 | $5,000–$10,000 |
| Case Size | 38mm | 38mm |
| Movement | Automatic H-10 | Automatic El Primero 3600 (5Hz) |
| Caliber Type | Automatic (ETA C07.611 base) | In-House Automatic Chronograph Manufacture |
| Power Reserve | 80 Hours | 60 Hours |
| Water Resistance | 100m (10 ATM) | 50m (5 ATM) |
| Crystal | Sapphire Crystal | Domed Sapphire |
| Case Material | Stainless Steel | Stainless Steel |
| Origin | Swiss Made | Swiss Made |
Category-by-Category Analysis
Design & Aesthetics
Hamilton's design language vs Zenith's approach
The Hamilton Khaki Field Automatic features a Stainless Steel case at 38mm with Sapphire Crystal protection. The Zenith Chronomaster El Primero offers Stainless Steel construction at 38mm with Domed Sapphire. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Automatic H-10 vs Automatic El Primero 3600 (5Hz)
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 Chronomaster El Primero uses the Automatic El Primero 3600 (5Hz) (In-House Automatic Chronograph Manufacture, 60 Hours reserve) at 36,000 vph (5 Hz). The Khaki Field Automatic edges ahead on power reserve.
Wearability & Fit
38mm vs 38mm — different wrist presence
At 38mm, the Khaki Field Automatic is similarly sized compared to the Chronomaster El Primero at 38mm. Water resistance differs: 100m (10 ATM) vs 50m (5 ATM).
Value & Cost of Ownership
Hamilton sits in the lower tier
The Hamilton Khaki Field Automatic sits at $500–$1,000 and the Zenith Chronomaster El Primero at $5,000–$10,000. On the specs that outlast any price: the Khaki Field Automatic uses Sapphire Crystal with 80 Hours, against Domed Sapphire and 60 Hours on the Chronomaster El Primero. Service intervals are typically 5-7 years for both.
Water Resistance
100m (10 ATM) vs 50m (5 ATM)
The Khaki Field Automatic is rated to 100m (10 ATM) while the Chronomaster El Primero handles 50m (5 ATM). The Khaki Field Automatic is better suited for water activities.
Materials Face-Off
| Component | Hamilton Khaki Field Automatic | Zenith Chronomaster El Primero |
|---|---|---|
| Case | Stainless steel, brushed finish. Hamilton does not publish the alloy grade for this reference. | Zenith El Primero 3600 |
| Crystal | Verneuil-grown sapphire, single-side AR coating. | Domed sapphire with anti-reflective coating |
| 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. | Stainless steel |
| Strap | Full-grain leather (varies by reference). | Fixed polished steel |
Cost of Ownership Compared
The Hamilton Khaki Field Automatic saves you $8,697 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 Zenith Chronomaster El Primero if…
- Buyers wanting a true in-house manufacture chronograph — the El Primero is one of the three original automatic chronograph movements (1969)
- High-beat movement enthusiasts — 5 Hz / 36,000 vph gives a uniquely smooth sweep and 1/10th-second timing precision
- Smaller-wristed buyers — 38mm wears elegantly on 6"–7" wrists, rare in the chronograph category
- Heritage collectors — the Charles Vermot story (secretly preserving the caliber from corporate destruction) is one of horology's greatest narratives
- Practical daily wearers — 60-hour power reserve gives weekend-off breathing room
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)
Zenith Chronomaster El Primero
- 19mm lug awkward for aftermarket.
- 1/10 second chronograph means seconds hand rotates faster — can confuse first-time users.
- 50m WR despite expensive watch.
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 AmazonZenith
Chronomaster El Primero
Choose the Zenith Chronomaster El Primero if you value In-House Automatic Chronograph Manufacture technology, Swiss Made heritage, and 38mm proportions. At $5,000–$10,000, the Automatic El Primero 3600 (5Hz) with 60 Hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Hamilton Khaki Field Automatic and Zenith Chronomaster El Primero represent two distinct approaches to fine watchmaking — the Hamilton bringing Swiss Made tradition while Zenith delivers Swiss Made engineering.
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.