Best 39mm watches

A sapphire crystal and bezel, 200m, a screwed crown and a Miyota 9075 that Baltic describes as a true GMT, in a 39.5mm case with a 47mm lug-to-lug.

13.8mm thick, and sold direct; we earn nothing on this link.

Baltic states the Miyota 9075 is a true GMT — the local hour hand jumps independently — which is rare at this level. Add a double-domed sapphire crystal, a sapphire 24-hour bezel, a screwed crown and 200m in a 39.5mm case. Sold direct; we earn nothing on it.

A field-styled Seiko 5 with 100m and the published $176 4R overhaul — the cheapest watch on this page to keep running.

Its 48.1mm lug-to-lug is the longest here, so it wears larger than 39.4mm suggests. Hardlex rather than sapphire.

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.

The same field case with a caller GMT — a 24-hour hand you set independently — on the same $176 published overhaul.

Hardlex, and 13.6mm thick.

Identical movement and identical service cost to the SSK001 in a case 3mm narrower. If the 42.5mm SSK001 is too much watch, this is the same purchase in a size more wrists can carry.

A 39mm, 200m diver with a sapphire bezel insert and a 47mm lug-to-lug — a dive watch that wears like a field watch.

Baltic states no warranty term on the page we read. Sold direct.

The sapphire bezel insert is the part that matters for keeping: aluminum inserts fade and ceramic chips, and this does neither. Baltic sells direct, so there is no buy button here from us.

39.3mm and under 10mm thick, with sapphire and an 80-hour Powermatic 80 — the dress watch of this size.

30m and a 19mm lug width. Tissot does not publish its lug-to-lug.

Under 10mm thick with 80 hours of reserve is the combination that makes a dress watch practical — put it down on Friday and it is still running Monday. 30m means keep it off in the shower.