La Bisontine 18''' Lépine Type 4

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18”’ | Hand Wind | Cylinder | Small Seconds |

Remarks:

Lépine = open face movement
Type 4 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 is also a 11”’ version of this type 4 movement

Listing ID: 930
Manufacturer / Brand: La Bisontine = Société anonyme d’horlogerie de Besançon / La Bisontine
Caliber: 18''' Lépine Type 4
Size in French Lignes: 18'''
Size range mm largest diameter: > 40 mm
Shape: Round
Winding: Manual (Crown)
Hands Setting: Crown with pin/pusher
Seconds Hand: Small seconds
Escapement: Cylinder
Date, Day, Month...: None
Jewels: 10
Balance Position: Bottom (120 - 240°)
Shock Protection: None
Beats per hour: 18,000
Balance Type: Brass
Power Reserve: Unknown
Production Period: Probably around 1905
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-51#post-6953400
External Link 2: https://watch-movements.eu/blog/en/2021/11/01/la-bisontine-movements-and-watches-from-besancon/
Country: France