Omega Speedmaster Professional vs Hamilton Khaki Field Automatic
Omega's chronograph meets Hamilton's field watch
Quick Verdict
The Hamilton Khaki Field Automatic ($500–$1,000) delivers Automatic (ETA C07.611 base) technology in the tier below the Omega Speedmaster Professional ($5,000–$10,000). The Khaki Field Automatic measures 38mm and is rated 100m (10 ATM). The Speedmaster Professional justifies its premium with Swiss Made heritage and Manual-Winding Caliber 3861. Both represent excellent choices in the luxury watch category.
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Specifications Compared
| Feature | Omega Speedmaster Professional | Hamilton Khaki Field Automatic |
|---|---|---|
| Price | $5,000–$10,000 | $500–$1,000 |
| Case Size | 42mm | 38mm |
| Movement | Manual-Winding Caliber 3861 | Automatic H-10 |
| Caliber Type | In-House Manual-Winding Manufacture (Co-Axial) | Automatic (ETA C07.611 base) |
| Power Reserve | 50 Hours | 80 Hours |
| Water Resistance | 50m (5 ATM) | 100m (10 ATM) |
| Crystal | Hesalite or Sapphire | Sapphire Crystal |
| Case Material | Stainless Steel | Stainless Steel |
| Origin | Swiss Made | Swiss Made |
Category-by-Category Analysis
Design & Aesthetics
Omega's design language vs Hamilton's approach
The Omega Speedmaster Professional features a Stainless Steel case at 42mm with Hesalite or Sapphire protection. The Hamilton Khaki Field Automatic offers Stainless Steel construction at 38mm with Sapphire Crystal. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Manual-Winding Caliber 3861 vs Automatic H-10
The Speedmaster Professional runs the Manual-Winding Caliber 3861 (In-House Manual-Winding Manufacture (Co-Axial), 50 Hours power reserve) at 21,600 vph (3 Hz) frequency. The Khaki Field Automatic uses the Automatic H-10 (Automatic (ETA C07.611 base), 80 Hours reserve) at 21,600 vph (3 Hz). The Khaki Field Automatic offers a longer power reserve.
Wearability & Fit
42mm vs 38mm — different wrist presence
At 42mm, the Speedmaster Professional has a bolder wrist presence compared to the Khaki Field Automatic at 38mm. Water resistance differs: 50m (5 ATM) vs 100m (10 ATM).
Value & Cost of Ownership
Hamilton sits in the lower tier
The Omega Speedmaster Professional sits at $5,000–$10,000 and the Hamilton Khaki Field Automatic at $500–$1,000. On the specs that outlast any price: the Speedmaster Professional uses Hesalite or Sapphire with 50 Hours, against Sapphire Crystal and 80 Hours on the Khaki Field Automatic. Service intervals are typically 5-7 years for both.
Water Resistance
50m (5 ATM) vs 100m (10 ATM)
The Speedmaster Professional is rated to 50m (5 ATM) while the Khaki Field Automatic handles 100m (10 ATM). The Khaki Field Automatic offers superior water resistance.
Materials Face-Off
| Component | Omega Speedmaster Professional | Hamilton Khaki Field Automatic |
|---|---|---|
| Co-Axial Caliber 3861 | Manual-wind chronograph with Co-Axial escapement (George Daniels design, licensed 1999). Si14 silicon balance spring, free-sprung balance, 234 components, 26 jewels | Stainless steel, brushed finish. Hamilton does not publish the alloy grade for this reference. |
| Hesalite Crystal | Hardened acrylic (Mohs ~2–3) with embossed central Omega logo — the NASA flight-qualified specification Mohs 2.5 | Verneuil-grown sapphire, single-side AR coating. |
| Silicon Balance Spring (Si14) | Omega's proprietary Si14 silicon hairspring — in series production since 2008 | 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. |
| Aluminum Tachymeter Bezel | Fixed black anodized aluminum with white tachymeter scale. Preserves the "DOT OVER NINETY" detail from the Apollo 11–era watches | Full-grain leather (varies by reference). |
| Stainless Steel Case | 42mm asymmetric case with integrated crown guards (added in 1964 for the 105.012 — the reference Buzz Aldrin wore on the Moon) | — |
Cost of Ownership Compared
The Hamilton Khaki Field Automatic saves you $6,930 over 5 years of ownership
Who Should Pick Which
Pick the Omega Speedmaster Professional if…
- History and heritage enthusiasts — the only watch worn on the Moon, with NASA documentation to prove it
- METAS Master Chronometer accuracy at sub-$8,000 — antimagnetic to 15,000 gauss, 0/+5 sec/day
- Chronograph lovers — the manual-wind ritual and hand-wound feel is deeply satisfying
- Value seekers at grey market $5,200–$5,500 — one of the cheapest 5-figure-quality chronographs from a top-tier maison
- Available off-the-shelf — walk into any Omega boutique and buy one today (no Rolex-style waitlist)
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
Omega Speedmaster Professional
- Hesalite scratches — acrylic at Mohs ~2–3 is dramatically softer than sapphire. Polishes out with PolyWatch in 5 minutes, but it's high-maintenance for desk-diving wear
- No screw-down crown, 50m water resistance — this is a NASA chronograph, not a dive watch. Shower-safe, swim-cautious, never deep water
- Manual wind — not for the set-and-forget buyer. Daily winding is part of the ritual; some find it charming, some find it inconvenient
- Wears thick at 13.18mm with a proud bezel — reads as 43–44mm visually because of the broad lug profile
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)
Our Verdict
Omega
Speedmaster Professional
Choose the Omega Speedmaster Professional if you prioritize In-House Manual-Winding Manufacture (Co-Axial) engineering, Swiss Made craftsmanship, and 50m (5 ATM) water resistance. At $5,000–$10,000, it delivers Manual-Winding Caliber 3861 with 50 Hours power reserve.
Check Price on AmazonHamilton
Khaki Field Automatic
Choose the Hamilton Khaki Field Automatic if you value Automatic (ETA C07.611 base) technology, Swiss Made heritage, and 38mm proportions. At $500–$1,000, the Automatic H-10 with 80 Hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Omega Speedmaster Professional and Hamilton Khaki Field Automatic represent two distinct approaches to fine watchmaking — the Omega bringing Swiss Made tradition while Hamilton delivers Swiss Made engineering.
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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.