To celebrate Seiko's history of producing incredible divers watches, the 50th Anniversary Prospex harks back to historic Tuna models, with iconic case design, while ensuring it is packed with high quality materials and Seiko's obsessive attention to craftsmanship. Inside the watch is a high grade 8L35 automatic mechanical movement, with day function, and around 50 hour power reserve. Protecting this is a 1000m Professional Diver tested case constructed from rose gold PVD plated Titanium, as well as black plated Titanium and ceramic bezel. The case curves around the bezel, protecting it from knocks, and has the crown kept safe at 4 o'clock. The dial is designed with true diver's legibility in mind, and features a matt black design with highly luminous hands and markers for unbeatable visibility in any light. Fastening the watch to the wrist is a silicone strap, with expansion sections.