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Powered by a mainspring and assured by the revolutionary tri-synchro regulator, 'Spring Drive' delivers an accuracy of ±15 seconds a month. Featured by a vertical clutch, it is by far the world's most accurate chronograph driven ay a mainspring, capturing the very moment of the sweep second hand.
|Additional information||The "vertical clutch," a mechanism for transmitting power while eliminating the distinct jump of the chronograph second hand at the start of a measurement, was the traditional mechanism first introduced by Seiko in its automatic winding chronograph released in 1969. For high accuracy, a pillar wheel mechanism ensuring secure movement is adopted for the operation mechanism.|