Hamilton Khaki Field Mechanical 38mm vs Khaki Field Titanium Auto

Buy the Khaki Field Mechanical 38mm if you want the classic field watch: 38 mm steel, hand-wound, 80-hour reserve, sapphire, $675 [1]. Buy the Titanium Auto if you never want to wind and want to swim: 42 mm titanium, automatic, 100 m, $1,195, listed "available soon" [2]. For most first field-watch buyers, the 38mm is the better value. Buy the Khaki Field Titanium Auto if you want a watch you never have to wind and can swim with. It's a 42 mm titanium case rated to 100 m, with the automatic H-10 movement, for $1,195 [2]. Hamilton listed the Titanium Auto as "available soon" when we checked [2]. For most first field-watch buyers, the 38mm Mechanical is the better value.

Winding. The 38mm Mechanical has no rotor. You wind the crown, and a full wind runs 80 hours [1]. Many owners like the daily ritual. If you'd forget, or if you rotate several watches, the Titanium Auto's self-winding H-10 keeps running while you wear it [2].

Size. At 38 mm and 9.5 mm thick, the Mechanical sits flat and fits under a cuff [1]. A 38 mm owner praises the slim case on NATO straps [3]. The Titanium Auto is 42 mm and 11.45 mm thick [2]. On a small wrist, that's a real difference. Hamilton also lists the Mechanical in 36 mm and 42 mm on the same page [1].

Water. The Mechanical is rated to 50 m [1], fine for rain and hand-washing. The Titanium Auto is rated to 100 m [2]. A five-year owner of the 42 mm titanium says theirs has been swimming and cliff diving [4].

Weight and material. Titanium is lighter than steel. A 42 mm titanium owner calls the watch very light [5]. Hamilton's pages in our source don't list a weight for either model, so we can't give you grams.

Accuracy. Hamilton doesn't publish a rate spec on either page in our source. A 38 mm owner reports about -2 to +3 seconds a day, while other H-50 owners report about +7 or +8 [6].

Price. The Titanium Auto costs $520 more [1][2].

• You want a slim, classic field watch under $700 [1].
• You have a smaller wrist or wear shirt cuffs [1][3].
• You enjoy winding a watch.
• You don't swim with your watch.

• You want a self-winding watch [2].
• You swim, snorkel or work around water [2][4].
• You prefer a larger 42 mm dial and a light case [2][5].
• You like seeing the movement through a display back [2].

If you want a 200 m rating and a rotating compass ring in a 39.5 mm case, the Seiko Alpinist SPB121 is rated to 20 bar [7]. See Hamilton Khaki Field vs Seiko Alpinist and our field watches roundup.

Heat and sun. Both have sapphire crystals [1][2]. A 42 mm titanium owner says the crystal is super reflective [5], which can make it hard to read in bright sun. Matte steel on the Mechanical doesn't flash as much as polished steel.

Sweat and straps. The Mechanical comes on a textile NATO [1], which dries fast and washes easily after a hot hike. The Titanium Auto ships on cow leather [2], which doesn't love sweat. Owners often swap to a NATO for summer.

Dust. Both have 20 mm lugs [1][2], so straps are easy to find. Rinse grit off the crown before winding the Mechanical, since you'll be turning it every day.

Knocks. A mechanic who wears the 38 mm titanium auto says impact tools dinged the case while the crystal stayed clear [8]. Titanium scratches, but sapphire held up.

Khaki Field Mechanical 38mm [1][2]

• A 38 mm owner praises the slim case on NATO straps and finds the 80-hour reserve believable [3].
• An owner of a one-year-old H69439931 says the crown popped off while winding [9].

Khaki Field Titanium Auto

• A five-year owner says the light case was a daily for four years and has been swimming and cliff diving [4].
• A 42 mm owner's complaint is a super reflective crystal [5]. Another owner cites weak lume and a crown that started spinning free [8].