Grand Seikoのインスタグラム(grandseikoofficial) - 10月27日 19時36分

A chronograph of the highest precision 
The Spring Drive Chronograph offers the same one second a day precision in its measurement of elapsed time as it achieves with time of day and so is the most accurate chronograph in the history of the spring-driven watches. Furthermore, the glide motion of the chronograph seconds hand assures that the chronograph stops at the exact moment that the button is depressed and not just at the nearest tick. Caliber 9R86 also delivers a remarkable power reserve of 72 hours even when the chronograph is in continuous use.

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