Movement 644 small second, pointer date

Movements Movement 644 small second, pointer date
Developed by Oris.
Number:
Oris 644, base ETA 2836-2
Dimensions:
Ø 25.60 mm, 11 1/2’’’
Functions:
Centre hands for hours and minutes, subsidiary second at 9 h, date by centre hand, date corrector, fine timing device and stop-second
Winding:
Automatic winding, bi-directionally rotating red rotor
Power-Reserve:
38 hrs
Vibrations:
28’800 A/h, 4 Hz
Jewels:
27