Seiko Prospex Sea

The Seiko Prospex Sea, reference SRP639, is a dive watch with a 48 mm steel case. The case measures 13.8 mm thick, with a water-resistance rating of 200 metres. The movement is self-winding calibre 4R36, which contains 24 jewels and has a power reserve of approximately 41 hours. The watch has a Hardlex crystal. The dial has a date display and a day display. LumiBrite appears on the hands and indices; the case has a screw-down crown. The case has a lug width of 22 mm. A silicone strap is attached to the watch.