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The 4207 is a tiny movement which also uses an equally tiny main spring. Its power reserve is significantly smaller than the 7s caliber which has a bigger main spring. The smaller mass of the oscillating rotor may also mean that automatic winding is less efficient compared to the bigger mass of a typical 7s rotor. Therefore, it makes sense to add a manual wind feature to assist in keeping the main spring fully wound. Too bad the 4207 doesn't hack but the average woman typically does not really care about syncing their automatic watches to the time signal.
Item created by: Lethe on 2015-08-10 17:31:17
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