Seiko Prospex

The Seiko Prospex, reference SJE117JC, has a 39.5 mm steel case. The case is 12.3 mm thick, with a lug-to-lug measurement of 47.2 mm. Self-winding calibre 6L37 contains 26 jewels and has a power reserve of approximately 45 hours. The watch has a box-shaped sapphire crystal with an anti-reflective coating on the inner surface. Fastening is by a folding clasp with push-button release and an extender. The dial has LumiBrite on the hands and indices; the movement is visible through a display back. Movement accuracy is plus 15 to minus 10 seconds per day; the watch has magnetic resistance. The case has a screw-down crown.