HYAKUICHI 1st diver's model [SUBMARINE] ISO standards usually state that a watch is "water resistant to a minimum of 100 meters and has a device (such as a rotating bezel) that can measure elapsed time under water". A diver's watch that has been defined as a diver's watch. The hyaku 1-001 far exceeds that standard. Reliable Japanese movement with unidirectional rotating bezel, screw-in crown and more A high spec model that can be used for diver applications. The face, the logo design, the size of the applied indexes, the Machined aluminum bezel, Arabic numerals in date font, etc. All the elements of the design are well-balanced. It's strong, high-specification, water-resistant to 200 meters, and The heavy stainless steel case, the screw-lock crown, and other features make it possible for the watch to withstand its function. More than just price.