10 1/2”’ | Hand Wind | Swiss Lever | Small Seconds |

Remarks:

• Rocking bar winding
• Ratchet wheel and click on the dial side
• Pillar construction
• Two slightly different bridge designs available (see pictures)
• Movement family:
  • Osco 300: 10 1/2”’, indirect sweeping seconds
  • Osco 400: 10 1/2”’, small seconds
  • Osco 500: 11 1/2”’, indirect sweeping seconds, date
  • Osco 600: 11 1/2”’, small seconds, date

• Listing ID: 20091
• Manufacturer / Brand: Osco
• Caliber: 400
• 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: Small seconds
• Escapement: Lever (Swiss, English, Glashütte)
• Date, Day, Month...: None
• Jewels: 15
• Setting Lever Screw/Pin Position: Left
• Balance Position: Bottom (120 - 240°)
• Shock Protection: Kif-Trior
• Beats per hour: 18,000
• Balance Type: Nickel
• Power Reserve: Approx. 40 hours
• Production Period: Unknown, probably around 1969
• Country: Germany
• Identification: Movement marked with OS 400 under the balance wheel. Listed in the Engelkemper catalog from 1969.
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)