Valjoux 7770
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Self-winding Rattrapante chronograph movement with 25 jewels, ball-bearing rotor, unidirectional winding, 1/8-seconds counter, 30-minutes counter, 12-hours counter, 28.800 A/h, power reserve ca. 44 hours.
Variation of the Valjoux 7750, with rattrapante function.
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