10 1/2”’ | Hand Wind | Swiss Lever | No Seconds |

Remarks:

• Shown in the Classification Horlgère with a setting lever spring. This movement here has none, hence the unofficial designation “old”.
  AS often had the same caliber number, first without and later with setting lever spring.
• In this case, the model number 307 in the Swiss Official Gazette of Commerce matches the manufacturer’s caliber designation. This is usually not the case.

• Listing ID: 1395
• Manufacturer / Brand: AS
• Caliber: 307 old
• Size in French Lignes: 10 1/2'''
• Size range mm largest diameter: 22 - 31 mm
• Shape: Round
• Winding: Manual (Crown)
• Hands Setting: Crown
• Seconds Hand: None
• Escapement: Lever (Swiss, English, Glashütte)
• Date, Day, Month...: None
• Jewels: 15
• Setting Lever Screw/Pin Position: Right
• Balance Position: Bottom (120 - 240°)
• Shock Protection: None
• Beats per hour: 18,000
• Balance Type: Monometallic screw balance
• Power Reserve: Unknown
• Production Period: Unknown, probably at least from 1916 to 1936
• Identification: Registered in the Swiss Official Gazette of Commerce in 1916 as AS model No. 307. Listed in the Classification Horlogère of 1936.
• External Link: https://uhrforum.de/threads/identifizierte-uhrwerke-die-weder-bei-ranfft-lorenz-noch-im-watch-wiki-zu-finden-sind.86322/page-46#post-6287034
• Country: Switzerland
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)