Valjoux 730

High-beat triple calendar chronograph, the replacement for the Valjoux 72C operating at 21,600 vibrations per hour. Produced from 1974 to 1979. Combines the 9-column wheel chronograph with full calendar functions: day window at 11:30, month window at 12:30, and central date hand. One of the final and most advanced movements in the classic Valjoux column-wheel family before the transition to the cam-operated 7750 series.