11 1/2”’ | Hand Wind | Swiss Lever | Small Seconds |

Remarks:

• Movement family:
  • FEF 290: 10 1/2”’, small seconds
  • FEF 290-1: 10 1/2”’, indirect sweeping seconds
  • FEF 310: 11 1/2”’, small seconds
  • FEF 310-1: 11 1/2”’, indirect sweeping seconds

• Listing ID: 14106
• Manufacturer / Brand: FEF
• Caliber: 310
• Size in French Lignes: 11 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: Incabloc
• Beats per hour: 18,000
• Balance Type: Monometallic screw balance
• Power Reserve: Approx. 50 hours
• Production Period: Unknown, probably around 1947
• Country: Switzerland
• Identification: Dial side marked with FEF 310. Listed in the Flume K1 catalog in the part from 1947.
• Contributor ©: Uhrforum.de member Opposed
• External Link: https://uhrforum.de/threads/identifizierte-uhrwerke-die-weder-bei-ranfft-lorenz-noch-im-watch-wiki-zu-finden-sind.86322/page-73#post-10150699