Mechanical Hi-Beat 36000 80 Hours, Caliber 9SA5
Caliber 9SA5 incorporates several new inventions, one of which is an overcoil. Created especially for this movement, this new overcoil has a unique curved shape that was decided after more than 80,000 simulations, as a result of which its performance is optimized in every possible position. The secret lies in the precision manufacture of the components and in the extraordinary adjustment skills of the watchmakers at the Grand Seiko Studio Shizukuishi.