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After a detailed investigation, 9F quartz caliber of the Grand Seiko watches, breaks with the conventions of quartz.
The second hand will stop at exactly the indicator seconds if no vibration, the mechanism for the instantaneous change in the calendar, which is faster than a blink and engine gear train are sealed in a separate cabin to ensure quality and accuracy.
The Grand Seiko Quartz is high precision, readability and reliability, along with the criteria set out to create the "ideal time".