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

Remarks:

• Predecessor of AM 420 without setting lever spring. See extra picture of AM 420 with setting lever spring.

• Listing ID: 14473
• Manufacturer / Brand: AM
• Caliber: 420 Predecessor
• 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: Left
• Balance Position: Bottom (120 - 240°)
• Shock Protection: None
• Beats per hour: 18,000
• Balance Type: Bimetallic screw balance
• Power Reserve: Unknown
• Production Period: Unknown
• Country: Switzerland
• Identification: Similarity to AM 420 listed in Ebauches SA catalog from 1928.
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)