In 1965 Seiko created its dive watch to fit the needs of the divers throughout Japan. Around 1968, Seiko introduced the 6159, their first Hi-Beat caliber to be cased in a dive watch with a rate of 36,000 bph. The movement was important in the sense that the high frequency was not only accurate, but also created more stable precision with less effect from shock due to it’s fast motion. For the 50th Anniversary of Seiko’s first diver, Seiko has unleashed a new limited edition 1000m diver, with its first Hi-Beat caliber to be found outside of Grand Seiko since the late 70’s. Today, we introduce you to the SBEX001, the Prospex Marinemaster Professional Limited Edition.