18 1/2”’ | Hand Wind | Swiss Lever | Small Seconds |

Remarks:

• Produced by different manufacturers and with different caliber designations over time:
  • 1937 – 1952: Thiel Saturn, until 1940 with click under the barrel bridge, afterwards click on the barrel bridge
  • 1952 – 1960: UMF Saturn
  • 1960 – 1961: UMF 15

• Listing ID: 21208
• Manufacturer / Brand: Ruhla UMF / Thiel
• Caliber: Saturn / 15
• Size in French Lignes: 18 1/2'''
• Size range mm largest diameter: > 40 mm
• Shape: Round
• Winding: Manual (Crown)
• Hands Setting: Crown
• Seconds Hand: Small seconds
• Escapement: Lever (Swiss, English, Glashütte)
• Date, Day, Month...: None
• Jewels: 7
• Setting Lever Screw/Pin Position: Left
• Balance Position: Left (240 - 360°)
• Shock Protection: None
• Beats per hour: 18,000
• Balance Type: Nickel
• Power Reserve: Approx. 36 hours
• Production Period: 1937 - 1961 (all generations)
• Country: Germany
• Identification: Dial of pocket watch marked with UMF Ruhla Saturn. As Thiel Saturn listed in the Flume K1 catalog in the part from 1947, as UMF 15/Saturn in the Flume K2 catalog from 1962.
• Contributor ©: Anonymous