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)