28,800 vph (8 Hz)
The Oris caliber 644 is an automatic movement introduced in 1997, based on the ETA 2836-2. It operates at 28,800 vph with Incabloc shock protection and a ball-bearing rotor. The movement features a small seconds subdial at 9:00 and a pointer date function, distinguished by Oris's characteristic red rotor. The caliber 641 is the COSC-certified chronometer variant of the 644.
TECHNICAL SPECIFICATIONS
Movement Type
Automatic
Frequency
28,800 vph (8 Hz)
Display Type
Analog
Rotor Type
Ball Bearing
Shock Protection
Incabloc
