Oris Caliber 641

Brand	Oris
Caliber Number	641
In-House?	No
Base Caliber	ETA 2836-2
Movement Type	Automatic, self-winding mechanical
Chronometer?	Yes
COSC?	Yes
Lignes	11.5”’
Diameter	26mm
Casing Diameter	25.6mm
Height	5.05mm (unconfirmed)
Jewel Count	27
Beat Rate	28,800 vph, 4Hz
Lift Angle	50 degrees
Power Reserve	~38 hours
Rotor Style	Ball-bearing
Rotor Winding Direction	Bi-directional
Hand-Windable?	Yes
Anti-Shock Device	Incabloc
Balance	Glucydur
Hand Count	4
Functions	Central hours; central minutes; small seconds at 9:00; central pointer date hand
Hacking Seconds?	Yes
Country of Manufacture	Switzerland, Swiss made
Known Models	Oris Classic Pointer Date (Add your watch to the comments below…)

The Oris caliber 641 is the COSC version of the Oris 644. Learn more here.

Additional Resources:

• More Oris calibers