A professional-grade dive watch that celebrates Seiko’s collaboration with JAMSTEC and its legacy of underwater innovation. Drawing design cues from the iconic 1968 Marinemaster, this limited-edition timepiece blends heritage styling with advanced modern engineering. The striking blue dial is inspired by the ocean, enhanced by high-contrast luminous markers and hands for exceptional readability in low-light conditions. Built with a robust stainless steel case and an impressive 300m water resistance, it is designed to perform under the most demanding environments while maintaining a refined, technical aesthetic. • Powered by the automatic movement with 35 jewels and a power reserve of up to 72 hours. • Presented on a silver stainless steel bracelet with push button deployment clasp. • Scratch resistant sapphire crystal glass. • 42.0mm case width. • 300 metre water resistance.