Introducing the Seiko Prospex Marinemaster HBF001J1, a professional-grade diver’s watch inspired by Seiko’s groundbreaking 1968 innovation—the world’s first hi-beat Diver’s watch. Designed with a case shape that pays tribute to the original Marinemaster, this modern reinterpretation carries forward Seiko’s proud heritage in diving timepieces while maintaining the same trusted 300m water resistance. Built for serious underwater performance, it reflects the core philosophy of Prospex: “Professional Specifications” designed for reliability in extreme environments.
Beneath the dual-curved sapphire crystal, the HBF001J1 features a black dial with a satin-finished professional texture, specifically engineered to minimise light reflection and enhance contrast underwater. Optimised for diving conditions, the dial is paired with strong Lumibrite for exceptional visibility in the darkest depths. The streamlined case includes a comfortable 4 o’clock crown position, a unidirectional rotating bezel compliant with ISO Diving standards, a ceramic insert bezel, and a super-hard coating for enhanced scratch resistance, ensuring durability in the most demanding conditions.
Powering the watch is Seiko’s advanced 8L45 calibre, a highly accurate and robust movement crafted at the Shizukuishi Watch Studio in Iwate prefecture, Japan. Delivering precision of +10/-5 seconds per day and a 72-hour power reserve, it is purpose-built for diving reliability and long-lasting performance. The Seiko Prospex HBF001J1 combines professional engineering, durability, and heritage design, making it an ideal choice for divers and adventure seekers who demand uncompromising quality.
