FHF 691 / ST 691

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6 3/4 x 8”’ | Hand Wind | Swiss Lever | Sweeping Seconds |

Remarks:

  • Differences to the 691N:
    • Other setting lever spring
    • Setting lever screw instead of pin
    • Dial-side opening to escape wheel straight instead of curved
    • Different click

 

  • Listing ID: 3333
  • Manufacturer / Brand: FHF / ST
  • Caliber: FHF 691 / ST 691
  • Size: 6 3/4 x 8'''
  • Shape: Form
  • Winding: Manual (Crown)
  • Hand Setting: Crown
  • Seconds Hand: Sweeping seconds (central seconds)
  • Escapement: Lever (Swiss, English, Glashütte)
  • Date & Day: None
  • Jewels: 17
  • Setting Lever Screw/Pin Position: Right
  • Balance Position: Right (0 - 120°)
  • Shock Protection: Ruby-Neutro-Shock
  • Beats per hour: 21,00
  • Balance Type: Nickel
  • Power Reserve: Unknown
  • Production Period: Probably around 1976, original data sheet from 1976 available
  • Identification: Marked with FHF/ST logo and 691 under balance wheel
  • External Link: https://uhrforum.de/threads/identifizierte-uhrwerke-die-weder-bei-ranfft-lorenz-noch-im-watch-wiki-zu-finden-sind.86322/page-26#post-3633471
  • Country: Switzerland
  • Contributor ©: Uhrforum.de member Badener (Andreas Kelz)

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