Tudor Black Bay GMT

The Black Bay GMT is Tudor's watch with a second time zone. The men's steel version has a "Pepsi" bezel: it rotates in both directions, and the 24-hour scale on its aluminium insert is divided into burgundy and blue halves. The Snowflake hands — a signature of the Black Bay design — are coated with Super-LumiNova. The 41 mm case combines satin and polished surfaces, with a domed sapphire crystal and a screw-down crown bearing the Tudor rose. Inside is an in-house movement: the self-winding calibre MT5652 shows the time in two time zones and the date at 3 o'clock.

When choosing within the collection, look at the dial, condition and completeness. Each listing gives the reference, calibre, power reserve, case and bracelet material, condition — from new to vintage — and what is included: box and papers.