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Seiko 5 series · automatic

Seiko 7S26-0200

A Seiko 5 wearing the 7S26 caliber under reference 7S26-0200 — three hands, day and date, automatic, see-through caseback. The pure form of a workhorse.

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Seiko 7S26-0200 reference

The Seiko 5 lineage

The "Seiko 5" line started in 1963 with the five core attributes that gave it its name: automatic winding, day and date at 3, water resistance, recessed crown at 4, and a durable steel case. It became Japan's answer to the affordable Swiss automatic, and the line has scarcely changed in form since.

Case reference 7S26-0200 covers a generation of Seiko 5s with the 7S26 caliber. See-through caseback, Hardlex crystal, simple bracelet — the kind of watch you wear because it works.

Inside the Seiko 7S26-0200

Like the SKX, this reference runs the 7S26 — no hacking, no hand-winding, just an automatic rotor and the simplest possible gear train.

Caliber

Seiko 7S26

21,600 bph3 Hz
1.000 rev/hcentre · minute hand · 80T8.0 rev/hthird · 60T / 10P60 rev/h · 1 rev/minfourth · seconds hand · 60T / 8P12.0 rev/minescape · 15T / 5Ppallet forkbalance · 21600 bph
6.00 Hz · 21,600 bph
Movement
Seiko 7S26
automatic, day-date
Frequency
21,600 bph
3 Hz
Jewels
21
Reserve
~41 hours
Case
Reference 7S26-0200
Seiko 5 series
Crystal
Hardlex mineral