The first diving watch from Seiko, and also the first in Japan , was manufactured in 1965, when watches with high water resistance were still relatively rare. It had a automatic caliber and was up to 150 meters water resistant The watch was designed for maximum reliability and readability even under the toughest conditions and was 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 the reliable companion However, this watch could do much more than just  The increasing popularity of scuba diving created a new, broad target audience for the watch. This led Seiko to continually long-lasting , precise and safe diving watches to develop, which continues to this day.

The reissue of this classic from 1965 in the Prospex collection remains the original design that is faithful , but was technologically on the updated It houses the specially developed for diving watches caliber 6R15 , which offers a power reserve of 50 hours when fully wound. The fact that the design remains 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 the 12 o'clock position , dem slim housing profile and the narrow bezel .

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