

Seiko 5 Classic White: 7S26 21 Jewels, 37mm, Exhibition Case Back
Collection
The Seiko SNKE57J1 belongs to the Seiko 5 series, which has been in continuous production for over six decades. It is one of the few entry-level automatics to rely on an in-house caliber: the reliable and low-maintenance 7S26. It features a 37mm case, 30m water resistance, and an exhibition case back to observe the rotor.
Case
Made of stainless steel, the case of the Seiko SNKE57J1 measures 37mm in diameter and 11mm in thickness. The bezel is fixed. The dial is protected by Hardlex glass, a proprietary Seiko treatment for light scratches. The case back is exhibition (transparent), allowing observation of the movement in operation. Its water resistance is 30m, suitable for splashes and rain.
Movement
The Seiko SNKE57J1 is powered by the automatic caliber 7S26, offering a power reserve of approximately 41 hours. This movement does not feature hacking (stopping the second hand for time setting) or manual winding — two functions intentionally omitted from this entry-level caliber. Its accuracy typically fluctuates around ±15 seconds per day, which is expected for an automatic movement in this segment.
Bracelet
The stainless steel bracelet of the Seiko SNKE57J1, secured by a folding clasp, consistently complements the case. The lug width is 18mm.
Specifics
Housing
Dial
Bracelet
Other features
Supplied with: Storage box, presentation pad, user manual.
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2-year international warranty