Oris Caliber 644
Oris Caliber 644

Oris Caliber 644

Brand Oris
Caliber Number 644
In-House?
No
Base Caliber
ETA 2836-2
Movement Type Automatic, self-winding mechanical
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 644 is an automatic watch movement with a small seconds subdial at 9:00 and a pointer date hand. This caliber is based on the ETA 2836-2 and was introduced as far back as 1997.

The 644 has the characteristic red rotor that Oris is known for.

Oris 644 VS 641:

There is a similar caliber 641 with the main difference being that the 641 is the certified chronometer (COSC) version of the 644.

644 VS 645:

Oris calibre 645 watches look like 644 powered watches from a distance, but upon closer inspection, the central pointer hand on the 645 is a pointer day, compared to the 644’s pointer date. The 645 has a datewheel with a date window at 3:00.

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