Seiko SNKP20

The Seiko reference SNKP20 has a steel case measuring 42.3 mm across. The case has a thickness of 11.3 mm, with a water-resistance rating of 50 metres. The movement is self-winding calibre 7S26, which contains 21 jewels and has a power reserve of approximately 40 hours. The watch has a Hardlex crystal. The folding clasp has a three-fold construction and a push-button release mechanism. The distance between the lugs measures 22 mm. The see-through case back has a screw construction.