Seiko 5 Men's Automatic Watch SNKK31J1 Black Red

Classic Black Seiko 5: 7S26 21 Jewels, 37mm, Exhibition Case Back

Collection

The Seiko SNKK31J1 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 7S26, which is reliable and inexpensive to maintain. It features a 37mm case, 30m water resistance, and an exhibition case back to view the rotor.

Case

Made of stainless steel, the case of the Seiko SNKK31J1 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 the movement to be observed in operation. Water resistance is 30m, suitable for splashes and rain.

Movement

The Seiko SNKK31J1 is powered by the automatic caliber 7S26, offering a power reserve of approximately 41 hours. This movement does not have hacking (stop-seconds for time setting) or manual winding — two intentionally absent functions on this entry-level caliber. Its accuracy hovers around ±15 seconds per day, which is expected for an automatic movement in this segment.

Bracelet

The stainless steel bracelet of the Seiko SNKK31J1, secured by a folding clasp, consistently complements the case. The lug width is 18mm.

Supplied with: Storage box, presentation pad, user manual.