Hamilton Khaki Field Murph 42mm Review: Is It Worth It?

The 42 mm is the original drawing, and the 38 mm is that drawing reduced. Matte black dial, printed Arabic numerals, cathedral hands, beige Super-LumiNova and an inner 24-hour track — the layout Hamilton has been putting on military-issue watches since the 1940s. There is no date, so the dial stays symmetrical. At this size the proportions work differently. The same dial furniture spread across a 42 mm canvas leaves more black between the numerals, and the cathedral hands read as slimmer against it. Whether that is better is a matter of taste; what is not a matter of taste is that this is the version the film used, and the version Hamilton drew first.

The H-10 is Hamilton's workhorse automatic, an ETA C07 derivative running at 21,600 vph with an 80-hour power reserve. That figure is the practical one: a watch taken off on Friday evening is still running on Monday morning, which the older 38-hour movements this replaced were not. The Nivachron balance spring is the part that punches above the price. It is a titanium-based alloy built to resist magnetic fields, and it appears here on a watch that is the same movement as the 38 mm — Hamilton did not save it for the newer reference. If your wrist spends its day next to a laptop, a speaker or a magnetic tablet cover, that is the specification doing real work. Hamilton publishes no rate tolerance for the H-10, so this record states none.

Stainless steel case, sapphire crystal with anti-reflective treatment, exhibition caseback, 100 m water resistance. At 11 mm the 42 mm case is actually a tenth of a millimetre thinner than the 38 mm, which is the sort of detail that only shows up when you put two specification sheets side by side. An open caseback on a field watch is unusual. A field watch is, historically, a sealed tool, and the glass back is a concession to the fact that people who buy this one want to look at the movement. It is also the reason 100 m is the ceiling rather than 200 m: swimming and showering, not diving.

Matte black and deliberately non-reflective, with beige vintage-style Super-LumiNova on both the cathedral hands and the printed numerals. The beige is a cosmetic decision — it reads as aged tritium rather than modern white — and it is what separates the Murph from the rest of Hamilton's field line visually. The inner 24-hour scale stays legible because it is printed smaller and lighter than the main numerals, and with no date window there is nothing interrupting the layout. On a 42 mm dial all of this has more room than it strictly needs, which is the clearest argument for this size: legibility at arm's length.

Black cow leather on a pin buckle, and 22 mm lugs. Twenty-two millimetres is a common width, so replacement straps are cheap and plentiful — a grey NATO, a brown suede or a rubber strap each change the watch substantially for well under $50. This reference does not come with a bracelet, and that is a genuine limitation on a watch just over $1,000. It is also the one thing that would most improve the value argument, which is a sentence that applies equally to the 38 mm.

This watch has not been worn, so what follows is read from the dimensions. The difference here is that Hamilton publishes the figure that matters: 53 mm lug-to-lug. That number does the deciding. On a 17 cm (6.7 in) wrist, 53 mm will sit close to the edges. On a 16 cm (6.3 in) wrist it will overhang, and no strap choice fixes overhang. From about 18 cm (7 in) upward it stops being a question at all. Measure your wrist before you read another review of this watch — it is a more useful five seconds than any paragraph anyone can write about how it wears, including this one. The strap helps at the margin. Leather on a pin buckle wraps closer than a bracelet, and at 11 mm the case is thin enough to slide under a cuff. Hamilton does not publish a weight for this reference, so no figure is given here.

Hamilton publishes no rate tolerance for the H-10 in this reference, so no accuracy figure is stated here, and this record lists accuracy among its unconfirmed fields rather than filling it with a number from elsewhere. The Nivachron hairspring is sometimes quoted as though it were an accuracy specification. It is not. It addresses magnetism — the watch is less likely to be pulled off rate by a magnetic field — which is a different property from how tightly it runs out of the box.