La Bisontine 18 3/4''' Lépine Type 3

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18 3/4”’ | Hand Wind | Swiss Lever | Small Seconds |

Remarks:

Lépine = open face movement
Type 3 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
There are also 12”’ and 19 3/4”’ Savonnette (hunter) movements of this type 3

Listing ID: 1026
Manufacturer / Brand: La Bisontine = Société anonyme d’horlogerie de Besançon / La Bisontine
Caliber: 18 3/4''' Lépine Type 3
Size: 18 3/4'''
Shape: Round
Winding: Manual (Crown)
Hand Setting: Crown with pin/pusher
Seconds Hand: Small seconds
Escapement: Lever (Swiss, English, Glashütte)
Date & Day: None
Jewels: 15
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: Probably around 1900
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-6760924
External Link 2: https://watch-movements.eu/blog/en/2021/11/01/la-bisontine-movements-and-watches-from-besancon/
Country: France