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Osco 52
Jewels: 15
Power Reserve: 33 hrs
Frequency: 18000 vph
Type: Manual Wind
Period used: 1903-1917
Diameter: 45.75 mm
Height: 10.1 mm
Hands: 2.46 x 1.27 / 0.30 mm
The Osco 52 watch movement was produced in a quantity of 53,500 units between 1903 and 1917. This open face calibre, model 5 movement features a bimetallic screw balance and a Breguet hairspring. It possesses a unique ratchet under the base plate and utilizes a negative stem mechanism with a rocker bar. The movement allows for stem winding, with switching possible through either the crown or lever. Additionally, it includes a sub-second function.
The Osco 52 features the following functions:
- Stem wind, switching by crown or lever
- Sub Second
Balance Staff Listing
| Ronda Reference # | Shock System | Buy |
|---|
Mainspring Listing
| Dimensions | GR Reference # | End Type | Buy |
|---|---|---|---|
| 2.92 x 0.229 x 570 x 17.5 mm | Manual | Buy mainspring |
Incabloc Part Listing
| Block # (Top/Bottom) | Cap Jewel # (Top/Bottom) | Spring # (Top/Bottom) |
|---|
KIF Part Listing
| Block # (Top/Bottom) | Cap Jewel # (Top/Bottom) | Spring # (Top/Bottom) |
|---|
Documents
Parts Listing
| Part Description | Reference # | Alternate | Buy |
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