Seiko's first dive watch, and also the first in Japan , was made in 1965, when watches with high water resistance were still relatively rare. It had an automatic caliber and was water resistant up to 150 meters . Designed for maximum reliability and readability even under the harshest conditions, the watch was used in the Japanese Antarctic Expedition (1966-1969) . Back when navigation technology was still in its infancy, a precise watch was absolutely essential for astronomical observations in the polar region, and the Seiko diving watch proved to be a reliable companion on every expedition. However, this watch could do much more than just meet the needs of Antarctic explorers. With the increasing popularity of scuba diving, a new broad target group developed for the watch. This set Seiko on the path of continuously developing durable , precise and safe diving watches , which continues to this day.

The reissue of this 1965 classic in the Prospex collection stays true to the original design but has been technologically updated . It houses the caliber 6R15 , specially developed for diving watches, which offers a power reserve of 50 hours when fully wound. That the design stays true to the original can be seen in the hour markers , which stand out sharply but still remain an integral part of the dial itself, the luminous dot at 12 o'clock , the slim case profile and narrow bezel .

The faithful replica of the diver's watch from 1965 has significantly improved characteristics. These include a stainless steel case and glass with a super hard coating, water resistance up to 200 meters for more reliability and a stainless steel bracelet for greater comfort both on the diving suit and directly on the wrist. The use of a special hard coating protects the watch better from scratches and increases its resilience.