10 3/4”’ | Hand Wind | Pin Lever | Indirect Sweeping Seconds |

Remarks:

• Rocking bar winding
• Click on the dial side
• Open mainspring barrel
• Movement had several names over time: Hektor II, M23, 23-42
• Predecessor of the famous Ruhla UMF 24
• Movement family:
  • Ruhla UMF 23-31: 0 jewels, small seconds
  • Ruhla UMF 23-32: 0 jewels, indirect sweeping seconds
  • Ruhla UMF 23-41: 5 jewels, small seconds
  • Ruhla UMF 23-42: 5 jewels, indirect sweeping seconds

• Listing ID: 19450
• Manufacturer / Brand: Ruhla UMF
• Caliber: 23-42 / M23
• Size in French Lignes: 10 3/4''' (10 1/2''' according to the manufacturer)
• Size range mm largest diameter: 22 - 31 mm
• Shape: Round
• Winding: Manual (Crown)
• Hands Setting: Crown
• Seconds Hand: Sweeping seconds (central seconds)
• Escapement: Pin Lever
• Date, Day, Month...: None
• Jewels: 5
• Setting Lever Screw/Pin Position: Left
• Balance Position: Bottom (120 - 240°)
• Shock Protection: None
• Beats per hour: 18,000
• Balance Type: Nickel
• Power Reserve: Approx. 28 hours
• Production Period: 1961 - 1963 (whole movement family)
• Country: Germany
• Identification: Movement marked with UMF 23. Listed in the Flume K3 catalog from 1972.
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)