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
Power Reserve
38h
Frequency
28,800 vph (4 Hz)
Diameter
25.6mm
Display Type
Analog
Rotor Type
Ball Bearing
Shock Protection
Incabloc
COMPLICATIONS
FEATURES
QUICK FACTS
FOR WATCH DEALERS
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Watches with this movement
Oris
Artelier Small Second, Pointer Date 2003
01 644 7545 4051-07 5 22 47
Oris
Artelier Small Second, Pointer Date 2003
01 644 7545 4051-07 8 22 71
Oris
Artelier Small Second, Pointer Date 2008
01 644 7597 4051-07 5 22 70FC
Oris
Artelier Small Second, Pointer Date 2008
01 644 7597 4051-07 8 22 75
Oris
Swiss Hunter Team Limited Edition
01 644 7635 4284-Set