Derived from the original Seiko 'Alpinist,' beloved by Japanese mountain men in 1959, this watch improves on the Alpinist's design with a focus on legibility. It's practical, with a compass and a super-hard coating for shine and scratch resistance and curved sapphire glass. The in-house 6R54 Calibre is the first Prospex GMT movement with a three-day power reserve for dual time zone tracking. Prospex, short for 'Professional' and 'Specifications,' embodies Seiko's dedication to creating durable, practical timepieces for adventurers and sports enthusiasts. Powered by the mechanical movement with 24 jewels and a power reserve of up to 72 hours.Presented on a black leather strap with push button deployment clasp.Scratch resistant sapphire crystal glass.39.5mm case width.200 metre water resistance.