Seiko introduces a new interpretation of the 1968 diver's watch into the Prospex collection, even better equipped to meet the challenges of the most extreme conditions on earth. The case, bezel and crown are all made of Seiko Ever-Brilliant steel. To ensure the durability of the watch, the crown is locked in a separate component built into the case. The watch is powered by the 8L35 calibre, developed specifically for diving watches and hand-assembled by the craftsmen of the Shizukuishi Watch Studio in northern Japan. The robustness and precision of the movement ensure the highest possible levels of performance in the most demanding environments, both on land and underwater.