Seiko 5 Sports GMT SSK001

Availability, honestly

The SSK001 itself is sold out. Its listing at our retail partner went dead at our September 2026 price check, and Seiko’s own US store shows the reference sold out at its $495 list price. The orange SSK005 is dead at our retailer too, and Seiko lists both bezel-less field GMTs — the SSK023 and the SSK025 — as sold out.

What Seiko still sells on this movement is the same watch in different dress, and those are the three priced below: the charcoal SSK019, the green SSK035 and the SSK036 on leather. All three share the 42.5 mm 5KX case, the 4R34 caller GMT and the 100 m rating described on this page, so everything below applies to them as written.

What a caller GMT does

The 4R34’s independently adjustable hand is the 24-hour hand. The local hour hand is geared to the minute hand and cannot be jumped on its own.

That makes it a caller GMT: designed for someone who stays in one place and wants to see another time zone at a glance. Set local time normally, set the 24-hour hand to your reference zone, and you are done.

A traveler GMT works the other way — the local hour hand jumps in one-hour steps while the 24-hour hand keeps home time, which is what you want when you land somewhere and need to change local time without disturbing anything else. Seiko builds those in the 6R54 Prospex references, at several times this price.

Getting a third time zone

The SSK001’s bezel is a rotating 24-hour scale, and that gives you a third zone: set local time on the hands, the 24-hour hand to zone two, then rotate the bezel so its offset against the 24-hour hand equals zone three.

The bezel-less field GMTs — the SSK023 and SSK025 — track two zones only, which is the practical difference between them and the SSK001 family and worth more than the dial color. Both are currently sold out at Seiko, so every GMT priced on this page has the bezel and therefore the third zone.

Sizing and case

It shares the 5KX case with the SRPD93, at 42.5 mm and 46 mm lug-to-lug, but is 13.6 mm thick rather than 13.4 mm because of the GMT works. That is a tall watch and it wears like one.

Like the rest of the 5 Sports line it is 100 m with a push-pull crown and no ISO 6425 marking. Swimming is fine; this is not a diver.

Setting it in the right order

Set the 24-hour hand first, then local time. Doing it the other way means re-checking the 24-hour hand, because on a caller movement the two are geared together and moving the hour hand moves the 24-hour hand with it.