Silena 10 1/2''' = Felsa 71 old

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10 1/2”’ | Hand Wind | Swiss Lever | No Seconds |

Remarks:

  • Base is an old version of the Felsa 71 without setting lever spring
  • Cover plate made of metal -> no jewel bearings underneath!
  • Here the patent refers to the shock protection, which is integrated into the corrector; this is only effective axially

 

  • Listing ID: 1491
  • Manufacturer / Brand: Felsa / Silena
  • Caliber: Silena 10 1/2''' = Felsa 71
  • Size in French Lignes: 10 1/2'''
  • Shape: Round
  • Winding: Manual (Crown)
  • Hands Setting: Crown
  • Seconds Hand: None
  • Escapement: Lever (Swiss, English, Glashütte)
  • Date, Day, Month...: None
  • Jewels: 7
  • Setting Lever Screw/Pin Position: Left
  • Balance Position: Bottom (120 - 240°)
  • Shock Protection: Silena (axially effective only)
  • Beats per hour: 18,000
  • Balance Type: Monometallic screw balance
  • Power Reserve: Unknown
  • Production Period: Unknown, probably before 1928
  • Identification: Patent number 102795 engraved on the ratchet wheel, referring to the Swiss patent CH102795 from 1924 by Koch/Silena: „Rückervorrichtung für Taschenuhren“ (Corrector device for pocket watches). The newer version with setting lever spring is listed in the Ebauches SA catalog from 1928.
  • External Link: https://uhrforum.de/threads/identifizierte-uhrwerke-die-weder-bei-ranfft-lorenz-noch-im-watch-wiki-zu-finden-sind.86322/page-45#post-6027262
  • Country: Switzerland
  • Contributor ©: Uhrforum.de member Badener (Andreas Kelz)

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