Oris Caliber 645
Oris Caliber 645

Oris Caliber 645

Brand Oris
Caliber Number 645
In-House?
No
Base Caliber
ETA 2836-2
Movement Type Automatic, self-winding mechanical
Lignes 11.5”’
Diameter
26mm
Casing Diameter
25.6mm
Height
4.6mm (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 Big Crown Pointer Day Small Seconds (ref: 01 645 7629 4061-07 8 22 76) (Add your watch to the comments below…)

The Oris caliber 645 is an automatic watch movement with a small seconds subdial at 9:00 and a pointer day hand. This caliber is based on the ETA 2836-2 and was introduced as far back as 1999.

The 645 has the characteristic red rotor that Oris is known for.

ETA 2824-2 or 2836-2 Base?

While older documentation referred to the 645 as being based on the 2824-2, The current Oris catalog references the 2836-2 as the base movement. This makes sense since the cal. 644 (pointer date, small seconds) is based on the 2836-2, and the 2836-2 is the day/date version of the 2824-2 – but it doesn’t answer where the 2824-2 information came from. Was is a mistake on the old marketing materials? Did they change the base to the 2836-2? Caliber Corner will attempt to reach out to Oris for clarification, and will update this page accordingly. In the meantime, we’re going with 2836-2 as the base (based on current Oris specs).

645 VS 644:

Oris calibre 64s watches look like 645 powered watches from a distance, but upon closer inspection, the central pointer hand on the 644 is a pointer date, compared to the 645’s pointer day with date at 3:00.

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