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Watches beating at 21,600 vibrations an hour (3Hz)

21,600 beats an hour (3Hz) sits between the slow vintage calibers and the 4Hz modern standard. It shows up often in manual-wind movements, where the lower rate eases wear on the escapement and stretches the power reserve.

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142 references in this beat rate

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Watches beating at 21,600 vibrations an hour (3Hz) | Grail Atlas