Japan’s first wristwatch, with 12 ligne movement designed in anticipation of an era when most watches would be worn on the wrist. The design and assembly were steep challenges for Seikosha, a Japanese watchmaker that had lagged behind in wristwatch mass production since it’s world start in the late 19th century. These challenges triggered a remarkable evolution in design technologies, precision engineering, and machine tool development at Seikosha. In 2014, the Japan Society of Mechanical Engineers (JSME) certified the wristwatch as a “Mechanical Engineering Heritage” that contributed to the development of machines in Japan.

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