12 1/2”’ | Automatic | Swiss Lever | Small Seconds |

Remarks:

• Lateral anchor
• Automatic as a module screwed onto base movement (caliber 15)
• Base movement with diameter 8 3/4”’ and large movement retaining ring, which is firmly screwed to the movement

• Listing ID: 1448
• Manufacturer / Brand: Buser / Frenca
• Caliber: 20
• Size in French Lignes: 12 1/2'''
• Size range mm largest diameter: 22 - 31 mm
• Shape: Round
• Winding: Automatic
• Hands Setting: Crown
• Seconds Hand: Small seconds
• Escapement: Lever (Swiss, English, Glashütte)
• Date, Day, Month...: None
• Jewels: 17, 21
• Setting Lever Screw/Pin Position: Right
• Balance Position: Bottom (120 - 240°)
• Shock Protection: Incabloc
• Beats per hour: 18,000
• Balance Type: Monometallic screw balance
• Power Reserve: Unknown
• Production Period: According to Hampel from 1946
• Country: Switzerland
• Identification: Listed in the "Official Catalogue of genuine Swiss Watch repair parts" from 1949 and in the Paulson catalog from 1950
• Contributor ©: Uhrforum.de member JackDaniels83
• External Link: https://uhrforum.de/threads/identifizierte-uhrwerke-die-weder-bei-ranfft-lorenz-noch-im-watch-wiki-zu-finden-sind.86322/page-46#post-6140314