Seiko Prospex Marinemaster 1968 Diver’s 300m Monochrome Stainless Steel Watch

This Seiko Prospex Marinemaster is a modern reinterpretation of the world’s first hi-beat diver’s watch, originally launched in 1968. Featuring a dual-curved sapphire crystal over a crisp white dial with a subtle sand-like texture, the watch is designed for maximum legibility underwater with strong Lumibrite, a unidirectional rotating bezel, and a crown positioned at 4 o’clock for comfort. The 42.6mm stainless steel case offers 300m water resistance, while the in-house 8L35 automatic calibre, crafted at Seiko’s Shizukuishi Watch Studio, delivers precision to +15/-10 seconds per day with a 50-hour power reserve. Blending Seiko’s diving heritage with modern engineering, the Marinemaster is built to meet the highest standards of performance and durability for professional divers.