15 1/4”’ | Key Wind | Cylinder | No Seconds |

Remarks:

• Type 1 is not an official caliber designation. As this is unknown, type <x> is used to distinguish between the different movement types of La Bisontine.
• The following types are known to date:
  • Type 1: cylinder escapement, keywind, cocks of the fourth wheel and the third wheel are connected
  • Type 2: cylinder escapement, crown winding with pusher, cocks of the fourth wheel and the third wheel are connected
  • Type 3: Swiss lever escapement, crown winding with pusher/lever, cocks of the fourth wheel and the third wheel are connected
  • Type 4: Cylinder escapement, crown winding with pusher, third wheel under the wheel train bridge
• Common to all types is the cover of the ratchet wheel and a special shape of the click. Types 1, 2 and 3 also have a common cock for the fourth and third wheel

• Listing ID: 1037
• Manufacturer / Brand: La Bisontine = Société anonyme d’horlogerie de Besançon / La Bisontine
• Caliber: 15 1/4''' Type 1
• Size in French Lignes: 15 1/4'''
• Size range mm largest diameter: 31 - 40 mm
• Shape: Round
• Winding: Manual (Key)
• Hands Setting: Key
• Seconds Hand: None
• Escapement: Cylinder
• Date, Day, Month...: None
• Jewels: 10
• Setting Lever Screw/Pin Position: None (Key Winding)
• Balance Position: Bottom (120 - 240°)
• Shock Protection: None
• Beats per hour: 18,000
• Balance Type: Brass
• Power Reserve: Unknown
• Production Period: Presumably around 1892 (early days of La Bisontine)
• Identification: Not listed in any movement finder. Movement marked with BISONTINE and a sitting dog on a base with the inscription BESANÇON (registered trademark of the company)
• External Link: https://uhrforum.de/threads/identifizierte-uhrwerke-die-weder-bei-ranfft-lorenz-noch-im-watch-wiki-zu-finden-sind.86322/page-50#post-6756284
• External Link 2: https://watch-movements.eu/blog/en/2021/11/01/la-bisontine-movements-and-watches-from-besancon/
• Country: France
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)