8 3/4 x 10”’ | Hand Wind | Swiss Lever | Direct Sweeping Seconds |

Remarks:

• Rocking bar winding
• Click on the dial side
• Movement family:
  • Osco 50: small seconds
  • Osco 52: direct sweeping seconds

• Listing ID: 7619
• Manufacturer / Brand: Osco
• Caliber: 52
• Size in French Lignes: 8 3/4 x 10'''
• Size range mm largest diameter: 22 - 31 mm
• Shape: Form
• Winding: Manual (Crown)
• Hands Setting: Crown
• Seconds Hand: Sweeping seconds (central seconds)
• Escapement: Lever (Swiss, English, Glashütte)
• Date, Day, Month...: None
• Jewels: 17
• Setting Lever Screw/Pin Position: Left
• Balance Position: Left (240 - 360°)
• Shock Protection: Monorex
• Beats per hour: 18,000
• Balance Type: Monometallic screw balance
• Power Reserve: Unknown
• Production Period: Unknown, probably around 1952
• Country: Germany
• Identification: Movement marked with Osco logo and KAL 52. Listed in the Flume K1 catalog in the part from 1952.
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)