6 3/4 x 8”’ | Hand Wind | Swiss Lever | No Seconds |

Remarks:

• Rocking bar winding
• Click on the dial side
• Same movement with 17 jewels: Osco 72

• Listing ID: 2188
• Manufacturer / Brand: Osco
• Caliber: 78
• Size in French Lignes: 6 3/4 x 8'''
• Size range mm largest diameter: 0 - 22 mm
• Shape: Form
• Winding: Manual (Crown)
• Hands Setting: Crown
• Seconds Hand: None
• Escapement: Lever (Swiss, English, Glashütte)
• Date, Day, Month...: None
• Jewels: 10
• Setting Lever Screw/Pin Position: Left
• Balance Position: Left (240 - 360°)
• Shock Protection: Rufarex
• Beats per hour: 18,000
• Balance Type: Nickel
• Power Reserve: Unknown
• Production Period: Unknown, probably around 1962
• Country: Germany
• Identification: Marked OS 72 under the balance. The Osco 78 is identical to the 72, but according to Flume has only 10 jewels instead of 17. Listed in the Flume K2 catalog from 1962.
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)
• External Link: https://uhrforum.de/threads/identifizierte-uhrwerke-die-weder-bei-ranfft-lorenz-noch-im-watch-wiki-zu-finden-sind.86322/page-41#post-5280532