10 1/2”’ | Hand Wind | Swiss Lever | Indirect Sweeping Seconds | Date |

Remarks:

• Date quick setting by repeatedly changing 21:30 – 24 o’clock
• Rocking bar winding
• Ratchet wheel and click on the dial side
• Movement family:
  • Osco 100: small seconds, without threads for movement holding screws
  • Osco 107: small seconds, with threads for movement holding screws
  • Osco 108: no seconds, date, with threads for movement holding screws
  • Osco 130: indirect sweeping seconds, with threads for movement holding screws
  • Osco 131: indirect sweeping seconds, date, with threads for movement holding screws

• Listing ID: 20108
• Manufacturer / Brand: Osco
• Caliber: 131
• Size in French Lignes: 10 1/2'''
• Size range mm largest diameter: 22 - 31 mm
• Shape: Round
• Winding: Manual (Crown)
• Hands Setting: Crown
• Seconds Hand: Sweeping seconds (central seconds)
• Escapement: Lever (Swiss, English, Glashütte)
• Date, Day, Month...: Date
• Jewels: 17
• Setting Lever Screw/Pin Position: Left
• Balance Position: Bottom (120 - 240°)
• Shock Protection: Rufarex
• Beats per hour: 18,000
• Balance Type: Nickel
• Power Reserve: Approx. 36 hours
• Production Period: Unknown, probably around 1969.
• Country: Germany
• Identification: Listed in the Engelkemper catalog from 1969.
• Contributor ©: Anonymous