Hamilton Khaki Field Mechanical 38mm vs Orient Bambino Open Heart
Hamilton's field watch meets Orient's timepiece
Quick Verdict
The Orient Bambino Open Heart ($250–$500) delivers Orient In-House Automatic, hand-winding and hacking technology in the tier below the Hamilton Khaki Field Mechanical 38mm ($500–$1,000). The Bambino Open Heart measures 40.5mm and is rated 30m (3 ATM). The Khaki Field Mechanical 38mm justifies its premium with Swiss Made heritage and Hand-Wound H-50 (ETA 2801-2 base). Both represent excellent choices in the luxury watch category.
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Specifications Compared
| Feature | Hamilton Khaki Field Mechanical 38mm | Orient Bambino Open Heart |
|---|---|---|
| Price | $500–$1,000 | $250–$500 |
| Case Size | 38mm | 40.5mm |
| Movement | Hand-Wound H-50 (ETA 2801-2 base) | Automatic Caliber F6T22 |
| Caliber Type | Hamilton/ETA Hand-Wound | Orient In-House Automatic, hand-winding and hacking |
| Power Reserve | 80 Hours | 40 Hours |
| Water Resistance | 50m (5 ATM) | 30m (3 ATM) |
| Crystal | Sapphire Crystal | Domed Mineral Crystal |
| Case Material | Stainless Steel | Stainless Steel |
| Origin | Swiss Made | Japanese Movement |
Category-by-Category Analysis
Design & Aesthetics
Hamilton's design language vs Orient's approach
The Hamilton Khaki Field Mechanical 38mm features a Stainless Steel case at 38mm with Sapphire Crystal protection. The Orient Bambino Open Heart offers Stainless Steel construction at 40.5mm with Domed Mineral Crystal. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Hand-Wound H-50 (ETA 2801-2 base) vs Automatic Caliber F6T22
The Khaki Field Mechanical 38mm runs the Hand-Wound H-50 (ETA 2801-2 base) (Hamilton/ETA Hand-Wound, 80 Hours power reserve) at 21,600 vph (3 Hz) frequency. The Bambino Open Heart uses the Automatic Caliber F6T22 (Orient In-House Automatic, hand-winding and hacking, 40 Hours reserve) at 21,600 vph (3 Hz). The Khaki Field Mechanical 38mm edges ahead on power reserve.
Wearability & Fit
38mm vs 40.5mm — different wrist presence
At 38mm, the Khaki Field Mechanical 38mm wears more compactly on smaller wrists compared to the Bambino Open Heart at 40.5mm. Water resistance differs: 50m (5 ATM) vs 30m (3 ATM).
Value & Cost of Ownership
Orient sits in the lower tier
The Hamilton Khaki Field Mechanical 38mm sits at $500–$1,000 and the Orient Bambino Open Heart at $250–$500. On the specs that outlast any price: the Khaki Field Mechanical 38mm uses Sapphire Crystal with 80 Hours, against Domed Mineral Crystal and 40 Hours on the Bambino Open Heart. Service intervals are typically 5-7 years for both.
Water Resistance
50m (5 ATM) vs 30m (3 ATM)
The Khaki Field Mechanical 38mm is rated to 50m (5 ATM) while the Bambino Open Heart handles 30m (3 ATM). The Khaki Field Mechanical 38mm is better suited for water activities.
Our Verdict
Hamilton
Khaki Field Mechanical 38mm
Choose the Hamilton Khaki Field Mechanical 38mm if you prioritize Hamilton/ETA Hand-Wound engineering, Swiss Made craftsmanship, and 50m (5 ATM) water resistance. At $500–$1,000, it delivers Hand-Wound H-50 (ETA 2801-2 base) with 80 Hours power reserve.
Check Price on AmazonOrient
Bambino Open Heart
Choose the Orient Bambino Open Heart if you value Orient In-House Automatic, hand-winding and hacking technology, Japanese Movement heritage, and 40.5mm proportions. At $250–$500, the Automatic Caliber F6T22 with 40 Hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Hamilton Khaki Field Mechanical 38mm and Orient Bambino Open Heart represent two distinct approaches to fine watchmaking — the Hamilton bringing Swiss Made tradition while Orient delivers Japanese Movement 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.