The oscillation of a crystal oscillator is susceptible to temperature fluctuations, so Caliber 9RA5 utilizes a temperature sensor located within its special silicon-on-insulator IC (SOI-IC) to collect temperature data 540 times daily, determine the influence of temperature changes within the IC and compensate for variations in the oscillator’s performance. Together, these innovative technologies define the next-generation Spring Drive movement, Caliber 9RA5.Ĭaliber 9RA5 achieves a high accuracy of ± 10 seconds per month in large part by using a high precision Spring Drive package IC, which is a vacuum-sealed package consisting of a carefully selected crystal oscillator aged for three months and an IC that is powered by an extremely small electric current. The One-piece Center Bridge guarantees the movement’s strength, durability and shock resistance. The Dual-size Barrels are of differing sizes and arranged to allow for expanded capacity while conserving space. By moving the position of the crown further back, the watch’s center of gravity is lowered and a perfect fit on the wrist results. Caliber 9RA5 is the Spring Drive movement that best embodies these skills and their passion.Ĭaliber 9RA5 has an accuracy rate of ☑0 seconds per month and utilizes the Offset Magic Lever to reduce the movement’s thickness by 0.8mm. At every step of the movement creation process, from development and design to manufacture, assembly, and adjustment, talented and expert craftsmen and women strive for the highest possible standards and maintain their complete dedication to the constant enhancement of their skills. At the birthplace of Spring Drive, the Shinshu Watch Studio, dedicated craftsmen and women meticulously assemble timepieces by hand part by part, from the case, dial, hands and indexes to all other components.

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