The “Tuna”
beloved for its unique design, high legibility, and functionality.The Professional Diver 600m
This is the world's first authentic diver's watch with a one-piece structure made of titanium and was water resistant to 600m saturation diving. More than 20 patents have been obtained for the exterior of the watch alone, including those related to airtightness and durability. The case was designed in a barnacle-like shape to prevent ropes and other objects from getting caught on it during deep-sea operations. Its unique shape has earned it the nickname "Tuna" among its fans, and it has been well loved for many years. The dial color is black with a matte finish for optimum legibility, and the large inverted triangular index at the 12 o'clock position and the distinctive hands, with the luminescent portions divided in two, are highly legible. The watch is fitted with an accordion strap, as it needs to be tightened due to the pressure in deep water.
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