Seiko Prospex Sea

The Seiko Prospex Sea, reference SFK001J1, is a dive watch with a 45 mm steel case. The case is 13.2 mm thick, with a lug-to-lug measurement of 51.8 mm and a water-resistance rating of 200 metres. Solar-powered calibre 5K65 contains 3 jewels. The watch has a sapphire crystal with an anti-reflective coating on the inner surface. Fastening is by a three-fold clasp with push-button release and an extender. The hands and indices carry LumiBrite; movement accuracy is plus or minus 15 seconds per month. Magnetic resistance is 4,800 A/m; the lug width measures 20 mm. The case has a screw-down crown.