Midsize automatic movement with improved shock resistance and accuracy. 19,800 BPH with Microstella regulation and Breguet overcoil. Chronometer-certified. Used in Oyster Perpetual midsize/ladies models (refs 6544-6807) from 1964 until early 1970s. Replaced by cal. 1570.
Movement Type
Automatic
Jewel Count
26 jewels
Power Reserve
42h
Frequency
19,800 vph (5.5 Hz)
Diameter
20mm
Height
5.4mm
Rotor Type
central_rotor
Winding
automatic_bidirectional
