19”’ | Hand Wind | Swiss Lever | Small Seconds |

Remarks:

• The crown wheel is missing on the movement shown
• Negative winding (referred to by the inscription “U. S. PAT. 24 MAY 1904” on the barrel bridge -> see patent US760647)
• Screw-set jewels (Chatons)
• Swan-neck fine regulator

• Listing ID: 3048
• Manufacturer / Brand: Tavannes
• Caliber: 19’’’ 3.B Ref 931
• Size in French Lignes: 19'''
• 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: 15
• Setting Lever Screw/Pin Position: None (Negative Winding)
• Balance Position: Right (0 - 120°)
• Shock Protection: None
• Beats per hour: 18,000
• Balance Type: Bimetallic screw balance with Breguet hairspring
• Power Reserve: Unknown
• Production Period: Unknown, probably around 1936
• Identification: Listed in the Classification Horlogère of 1936, but shown there is the Savonnette (hunter) version Ref. 930 of this Lépine (open face) movement.
• External Link: https://uhrforum.de/threads/identifizierte-uhrwerke-die-weder-bei-ranfft-lorenz-noch-im-watch-wiki-zu-finden-sind.86322/page-30#post-3948616
• Country: Switzerland
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)