Two time zones. One real GMT hand.

The 4R34 has an independently adjustable 24-hour hand. Pull the crown to the first position and that hand moves on its own, without disturbing the hour, minute or seconds hands. Set it to a second time zone, then read a third against the rotating 24-hour bezel. Enthusiasts call this arrangement a caller GMT; the flyer type, where the local hour hand jumps instead, costs far more.

It is a Seiko in-house automatic at 21,600 vibrations per hour on 24 jewels with a stated 41-hour reserve. It hacks and hand-winds. The Hardlex crystal carries a magnifier over the day-date window at three.

The bezel is split red for daytime hours and blue for night, with a 24-hour scale under a Hardlex insert. Set the red arrow hand to a second time zone and read it against the bezel. The colourway is the one collectors call Pepsi, borrowed from the classic GMT-Master pattern.

The dial underneath is black with cream-lumed markers and a red arrow tip on the GMT hand, so the second zone is the first thing you see.

Seiko lists 42.5mm across and 13.6mm thick. The five-row Jubilee-style bracelet spreads the weight, and the crown sits at four o’clock, but this is a large watch and a thick one. Try a 42mm watch you already own against it before buying.

Water resistance is 100m with a screw-down crown. That covers swimming. It is not a dive watch and the bezel is a 24-hour scale, not a dive scale.