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Why does the date on most Blancpain watches change over a long period of time?

April 26, 2017blancpain period time watches

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Why does the date on most Blancpain watches change over a long period of time?

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3 systems are to be noted. Instantaneous, semi-instantaneous and dragging. The coupling force on the watch barrel is different for each system. The semi-instantaneous and the dragging spread the force over several hours, contrarily to the instantaneous.