Crettiez 18 1/2''' Type 4b

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18 1/2”’ || Hand Wind | Swiss Lever | Small Seconds |

Remarks:

For detailed information about the different types of Crettiez movement see Crettiez – Watch movements and social riots (watch-movements.eu) and the attached categorization chart.
Like type 4a, but crown winding without pusher and with cover plate for hand setting wheels

Listing ID: 546
Manufacturer / Brand: Crettiez
Caliber: 18 1/2''' Type 4b
Size in French Lignes: 18 1/2'''
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: Left
Balance Position: Left (240 - 360°)
Shock Protection: None
Beats per hour: 18,000
Balance Type: Monometallic screw balance with Breguet hairspring
Power Reserve: Unknown
Production Period: Unknown, probably around 1920 - 1940
Identification: See link mentioned above
External Link: https://uhrforum.de/threads/identifizierte-uhrwerke-die-weder-bei-ranfft-lorenz-noch-im-watch-wiki-zu-finden-sind.86322/page-54#post-7243123
External Link 2: https://watch-movements.eu/blog/en/2022/05/01/crettiez-watch-movements-and-social-riots/
Country: France