17”’ | Hand Wind | Swiss Lever | Small Seconds |

Remarks:

• Dial side marked with Swiss patent number 125517, which was granted to A. Michel in 1927
• Height only 2.6 mm

• Listing ID: 21311
• Manufacturer / Brand: AM
• Caliber: 570
• Size in French Lignes: 17'''
• Size range mm largest diameter: 31 - 40 mm
• Shape: Round
• Winding: Manual (Crown)
• Hands Setting: Crown
• Seconds Hand: Small seconds
• Escapement: Lever (Swiss, English, Glashütte)
• Date, Day, Month...: None
• Jewels: 16
• Setting Lever Screw/Pin Position: Right
• Balance Position: Right (0 - 120°)
• Shock Protection: None
• Beats per hour: 18,000
• Balance Type: Bimetallic screw balance with Breguet hairspring
• Power Reserve: Approx. 40 hours
• Production Period: Unknown, probably around 1928+
• Country: Switzerland
• Identification: Dial side marked with AM and Ebauches SA trust logo (TR). Listed in the Ebauches SA catalog from 1928.
• Contributor ©: Anonymous