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Choose the 38mm Khaki Field Mechanical H69439931 if you want a hand-wound watch and a thinner case. Choose the 38mm Khaki Field Auto H70455133 if you prefer a rotor-driven automatic movement and want the higher stated water-resistance rating. Both list an 80-hour power reserve, sapphire crystal, and the same 47mm lug-to-lug length, so the key differences are how you power them, case thickness, water-resistance rating, and supplied strap or bracelet.
How the movements differ
Khaki Field Mechanical: you wind it by hand
The H69439931 uses Hamilton’s H-50 hand-wound movement. Hamilton’s official product description says: “Wind your mechanical watch by turning the crown clockwise.” Hamilton describes the H-50 as “an exclusive caliber specifically developed for our handwinding watches.” Those are manufacturer descriptions, not independent assessments.
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Khaki Field Auto: wrist movement winds it
The H70455133 uses Hamilton’s H-10 automatic movement. Hamilton explains that wrist movement swings an inner rotor, transferring energy to the mainspring and powering the watch. You do not need to wind it as part of normal wear in the same way as the hand-wound model.
Hamilton lists an 80-hour power reserve for both exact references. This is a manufacturer specification, not a comparative test of how long individual watches run in use.
#1 Best Overall
- MANUAL WINDING: Designed for precision, this hand-wound watch is powered by the exclusive H-50 movement, offering an extended 80-hour power reserve for reliable performance.
- WATER RESISTANT TO 50M: Withstands 5 bar (50 meters), ideal for swimming and outdoor pursuits. Perfect for those who demand resilient accessories that accompany them confidently on their explorative journeys.
- BUILT FOR ADVENTURE: Featuring a 38mm stainless steel case, a black dial and textile strap, this watch combines durability and functionality. With Super-LumiNova and sapphire crystal, it’s ready to tackle your outdoor challenges.
- PREMIUM MATERIALS: Textile strap with pin buckle offers day-long comfort. The clean lines and sophisticated design make it the perfect accessory for both casual wear and formal attire, merging functionality with fashion.
- RICH HERITAGE: Over a century of Hamilton's legacy in field watches, admired for precision. Originally designed for WWI soldiers, these timepieces combine rugged durability with history, showcasing Hamilton's commitment to quality and innovation.
What differs in the specifications?
| Specification | Mechanical H69439931 | Auto H70455133 |
|---|---|---|
| Movement | H-50, hand-wound mechanical | H-10, automatic |
| Case diameter | 38mm | 38mm |
| Thickness | 9.5mm | 11mm |
| Lug-to-lug | 47mm | 47mm |
| Lug width | 20mm | 20mm |
| Stated power reserve | 80 hours | 80 hours |
| Stated water resistance | 5 bar (50m) | 10 bar (100m) |
| Crystal | Sapphire | Sapphire |
| Listed supplied configuration | Textile strap with pin buckle | Stainless-steel bracelet with folding clasp |
These are specifications listed by Hamilton for references H69439931 and H70455133 on its Mechanical product page and Auto product page, accessed in 2026. Configurations may vary by reference and market.
Which one is thinner, and will they wear the same?
The Mechanical is listed at 9.5mm thick; the Auto is 11mm thick. Both are 38mm across, 47mm lug-to-lug, and use 20mm straps or bracelets. Those shared dimensions make them a useful like-sized comparison, but they do not prove identical comfort: wrist shape and personal preference affect fit, and no fit test is established here.
Rank #2
- Featuring a Green Band, Silver-tone Case, Scratch Resistant Sapphire Crystal
- - Case Colour: Silver
- - Case Shape: Round
- - Case Material: Stainless steel, satinised
What does the water-resistance difference mean?
Hamilton lists the Mechanical at 5 bar (50m) and the Auto at 10 bar (100m). The cited product pages do not specify which activities either rating guarantees. Treat the figures as the manufacturer’s stated ratings, not as an activity-by-activity promise; check Hamilton’s guidance for the exact watch and your intended use before exposing it to water.
How should price and supplied bracelet or strap affect the choice?
The cited pages show different configurations: the Mechanical page lists a textile strap and pin buckle, while the Auto page lists a stainless-steel bracelet and folding clasp. That changes the package you are comparing, and either configuration may differ by market or exact reference.
Rank #3
- MANUAL WINDING: Designed for precision, this hand-wound watch is powered by the exclusive H-50 movement, offering an extended 80-hour power reserve for reliable performance.
- WATER RESISTANT TO 50M: Withstands 5 bar (50 meters), ideal for swimming and outdoor pursuits. Perfect for those who demand resilient accessories that accompany them confidently on their explorative journeys.
- BUILT FOR ADVENTURE: Featuring a 38mm stainless steel case, a white dial and textile strap, this watch combines durability and functionality. With Super-LumiNova and sapphire crystal, it’s ready to tackle your outdoor challenges.
- PREMIUM MATERIALS: Textile strap with pin buckle offers day-long comfort. The clean lines and sophisticated design make it the perfect accessory for both casual wear and formal attire, merging functionality with fashion.
- RICH HERITAGE: Over a century of Hamilton's legacy in field watches, admired for precision. Originally designed for WWI soldiers, these timepieces combine rugged durability with history, showcasing Hamilton's commitment to quality and innovation.
The Mechanical product page surfaced for Greece lists a recommended retail price of €625 including VAT; the US Auto page lists $845. Because these figures are for different markets and currencies, they are not a valid direct price comparison. Check current local prices for both exact references and compare like-for-like packages. Both list a 20mm lug width, but verify strap compatibility and the desired material or bracelet configuration before buying.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Which Khaki Field should you buy?
Choose the Mechanical if
- You specifically want to wind the watch by hand.
- You value the thinner listed 9.5mm case.
- The manufacturer’s 5 bar rating fits your needs.
Choose the Auto if
- You prefer an automatic watch whose rotor winds the mainspring as you wear it.
- You place weight on its higher stated 10 bar rating.
- You want the listed stainless-steel bracelet configuration.
Neither is universally better. The Mechanical makes the most sense for the hand-winding interaction and slimmer case; the Auto is the fit for someone who prefers automatic winding and values its higher stated water-resistance rating. Hamilton’s listed specifications do not establish which is more accurate, less expensive to service, more durable, or more comfortable in real-world wear.
Quick Recap
Best Value
- MANUAL WINDING: Designed for precision, this hand-wound watch is powered by the exclusive H-23 movement, offering an extended 80-hour power reserve for reliable performance.
- WATER RESISTANT TO 100M: Withstands 10 bar (100 meters), ideal for swimming and outdoor pursuits. Perfect for those who demand resilient accessories that accompany them confidently on their explorative journeys.
- BUILT FOR ADVENTURE: Featuring a 40mm stainless steel case, a black dial and green textile strap, this watch combines durability and functionality. With Super-LumiNova and sapphire crystal, it’s ready to tackle your outdoor challenges.
- PREMIUM MATERIALS: Textile strap with pin buckle offers day-long comfort. The clean lines and sophisticated design make it the perfect accessory for both casual wear and formal attire, merging functionality with fashion.
- RICH HERITAGE: Over a century of Hamilton's legacy in field watches, admired for precision. Originally designed for WWI soldiers, these timepieces combine rugged durability with history, showcasing Hamilton's commitment to quality and innovation.
Rank #4
- MANUAL WINDING: Designed for precision, this hand-wound watch is powered by the exclusive H-23 movement, offering an extended power reserve for reliable performance.
- WATER RESISTANT TO 100M: Withstands 10 bar (100 meters), ideal for swimming and outdoor pursuits. Perfect for those who demand resilient accessories that accompany them confidently on their explorative journeys.
- BUILT FOR ADVENTURE: Featuring a 40mm stainless steel case, a white dial and green textile strap, this watch combines durability and functionality. With Super-LumiNova and sapphire crystal, it’s ready to tackle your outdoor challenges.
- PREMIUM MATERIALS: Textile strap with pin buckle offers day-long comfort. The clean lines and sophisticated design make it the perfect accessory for both casual wear and formal attire, merging functionality with fashion.
- RICH HERITAGE: Over a century of Hamilton's legacy in field watches, admired for precision. Originally designed for WWI soldiers, these timepieces combine rugged durability with history, showcasing Hamilton's commitment to quality and innovation.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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