Hamilton Khaki Field 38mm vs 42mm: which size fits

What the two listings confirm

Apart from size, the two listings describe the same watch: the Swiss H-10 automatic with an 80-hour reserve, 100m (10 bar) water resistance, sapphire crystal, Super-LumiNova and a black dial. The 38mm listing is on a leather strap with a pin buckle; the 42mm listing is on a stainless steel bracelet with a folding clasp, which partly explains the higher listed price.

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Why lug to lug matters more than 38 or 42

Case diameter tells you how wide the watch is across. Lug to lug tells you how long it is from the tip of the top lugs to the tip of the bottom lugs, and that is what decides whether the watch sits on top of your wrist or hangs over the edges. A watch whose lug to lug is wider than the flat top of your wrist will look too big, even if its diameter seems modest.

Thickness matters too. A thicker case sits higher, catches on cuffs and makes the watch feel bigger. Because neither Khaki Field listing gives lug to lug or thickness, get those numbers from Hamilton's product page for the exact reference you plan to buy. Read lug to lug explained for more.

Which size for your wrist

The ranges below are the common guideline used by the wrist fit calculator. They are a starting point, not a rule; personal taste, strap curve and thickness also matter. Field watches were traditionally small, so many people prefer to size down.

How to check the fit before you buy

As a worked example from the calculator's guideline: a 6.5 inch wrist is about 165mm around, so its flat top is estimated at about 49.5mm. Any lug to lug at or under that is likely to fit; up to about 53mm is borderline and worth trying on.

1. 1

   Measure your wrist with a soft tape or a strip of paper just above the wrist bone, where the watch will sit. See how to measure your wrist for a watch.

2. 2

   Look up the lug to lug and thickness for the 38mm and 42mm references on Hamilton's site, since the Amazon listings do not give them.

3. 3

   Enter your wrist size and the lug to lug in the wrist fit calculator. It estimates the flat top of your wrist at about 0.30 times your circumference.

4. 4

   If the result is fits, either size will sit on top of your wrist. If it is borderline, the smaller size is the safer pick. If it says likely overhang, choose the 38mm.

5. 5

   Think about the strap. The 42mm listing comes on a bracelet that will need links removed; see how to size a watch bracelet.

Style: 38mm vintage vs 42mm modern

The 38mm is closer in size to the military field watches the Khaki Field is based on. It reads as understated, slips under a shirt cuff and suits small and medium wrists. On a leather or canvas strap it is a classic one-watch choice.

The 42mm has more dial and more presence, which helps legibility and suits larger wrists. On its steel bracelet it looks more modern and sporty. If you have a large wrist and want more options, see the best automatic watches for large wrists; for smaller wrists, see the best automatic watches for small wrists.

Frequently asked questions

What is the lug to lug of the Hamilton Khaki Field 38mm? The Amazon listing does not state it, so we do not give a number here. Check Hamilton's product page for the exact reference before you buy.

Is 38mm too small for a man's wrist? Not by the common guideline. A 38mm case suits wrists up to about 7 inches, and many people with larger wrists choose it for the traditional field watch look.

Is the 42mm Khaki Field a different movement? No. Both listings state the Swiss H-10 automatic with an 80-hour reserve and 100m water resistance.

Should I choose the Khaki Field Mechanical instead? The Mechanical is listed only in 38mm here, with the hand-wound H-50 and 50m water resistance. See Khaki Field Mechanical vs Automatic.