Hamilton Khaki Field vs Seiko Alpinist

Twice the water rating, a year more warranty and a published accuracy tolerance, on a 6R35 whose US overhaul price Seiko publishes: $296.

It is 41mm across, but its 46.9mm lug-to-lug is actually shorter than the 38mm Khaki's — the Alpinist wears smaller than its diameter. At 12.3mm it is the thicker of the two.

This is where Seiko starts publishing an accuracy figure (+25/-15 seconds a day) and fits sapphire. A 6R35 overhaul is $296 against $176 for a 4R36 — a real difference, and one you can plan for.

The field watch as the pattern intended: 38mm, 11mm thick, a plain legible dial and an 80-hour H-10 with a Nivachron hairspring.

Two years of warranty and no US service price list are the costs. 100m covers swimming.

Mechanically identical to the Murph and usually cheaper, because it does not carry a film's name. 47mm lug-to-lug on a 38mm case is a genuinely versatile footprint.

Mechanically the same watch as the Khaki Field Auto, with the Murph's dial and a folding clasp.

Hamilton does not publish its lug-to-lug.

Hamilton fits Nivachron across the Khaki Field line — an antimagnetic hairspring, addressing the failure mode that used to send affordable mechanicals to the bench. This is a watch designed around the twenty-year case.

No rotor, 9.5mm thick and 80 hours on a wind — the closest thing here to the original issued watch.

50m is a quarter of the Alpinist's rating. It is the one to pick for a desk, not a river.

No rotor means fewer parts and a thinner case, and the H-50 runs 80 hours on a wind. This is the simplest genuinely good mechanical watch on this site, and simple is what survives.

If you like a Seiko field dial but not the Alpinist's tier, the Seiko 5 SRPG39 gives you a 39.4mm case, 100m and the published $176 4R overhaul.

Hardlex rather than sapphire, 41 hours rather than 70, and a 48.1mm lug-to-lug that wears longer than its diameter suggests.

The 39.4mm case reads small, but the 48.1mm lug-to-lug does not — this wears longer than its diameter suggests. Measure your wrist before you buy on the diameter alone.