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.
Additional Resources:
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