Crettiez 18 1/2''' Type 4a

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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.
Common bridge for fourth wheel, third wheel and center wheel
Ratchet wheel below the barrel bridge
Click on the outside of the barrel bridge
Setting lever screw to the left of the crown wheel
Two hand setting wheels
Without cover plate for hand setting wheels
In the French Cetehor catalog of 1946, a movement with this bridge side is listed as Crettiez 27/12
There is also a Crettiez type 4a-2 with different bridge design

Listing ID: 544
Manufacturer / Brand: Crettiez
Caliber: 18 1/2''' Type 4a
Size in French Lignes: 18 1/2'''
Size range mm largest diameter: > 40 mm
Shape: Round
Winding: Manual (Crown)
Hands Setting: Crown with pin/pusher
Seconds Hand: Small seconds
Escapement: Lever (Swiss, English, Glashütte)
Date, Day, Month...: None
Jewels: 16
Setting Lever Screw/Pin Position: Left
Balance Position: Left (240 - 360°)
Shock Protection: None
Beats per hour: 18,000
Balance Type: Bimetallic 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-53#post-7243106
External Link 2: https://watch-movements.eu/blog/en/2022/05/01/crettiez-watch-movements-and-social-riots/
Country: France