Seiko Prospex Marinemaster

The Seiko Prospex Marinemaster, reference SJE099J1, is a dive watch with a 39.5 mm steel case. The case is 12.3 mm thick, with a lug-to-lug measurement of 47.2 mm and a water-resistance rating of 200 metres. Self-winding calibre 6L37 contains 26 jewels and has a power reserve of approximately 45 hours. Over the dial is a box-shaped sapphire crystal with an anti-reflective coating on the inner surface. The clasp has a three-fold construction with push-button release and an extender. The dial has LumiBrite on the hands and indices. Movement accuracy is plus 15 to minus 10 seconds per day. A see-through case back provides a view of the movement.