5 3/4 x 10”’ | Hand Wind | Cylinder | No Seconds |

Remarks:

• Rocking bar winding
• Click on the dial side
• Movement family (see extra picture)
  • AM 90: crown wheel and ratchet wheel underneath the barrel bridge
  • AM 91: crown wheel and ratchet wheel above the barrel bridge

• Listing ID: 21315
• Manufacturer / Brand: AM
• Caliber: 90
• Size in French Lignes: 5 3/4 x 10''' (5 1/4''' according to manufacturer)
• Size range mm largest diameter: 22 - 31 mm
• Shape: Form
• Winding: Manual (Crown)
• Hands Setting: Crown
• Seconds Hand: None
• Escapement: Cylinder
• Date, Day, Month...: None
• Jewels: 6
• Setting Lever Screw/Pin Position: Left
• Balance Position: Left (240 - 360°)
• Shock Protection: None
• Beats per hour: 18,000
• Balance Type: Brass
• Power Reserve: Unknown
• Production Period: Unknown, probably around 1942
• Country: Switzerland
• Identification: Dials side marked with AM 90. Listed in the Ebauches SA catalog from 1942.
• Contributor ©: Anonymous