10 1/2”’ | Hand Wind | Swiss Lever | Small Seconds |

Remarks:

• Movement family with different bridge shapes (see extra picture):
  • Helvetia 81-24
  • Helvetia 81-26
  • Helvetia 81-28

• Listing ID: 9685
• Manufacturer / Brand: Helvetia
• Caliber: 81-24
• 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: Small seconds
• Escapement: Lever (Swiss, English, Glashütte)
• Date, Day, Month...: None
• Jewels: 15
• Setting Lever Screw/Pin Position: Left
• Balance Position: Bottom (120 - 240°)
• Shock Protection: Helvetia specific
• Beats per hour: 18,000
• Balance Type: Monometallic screw balance
• Power Reserve: Unknown
• Production Period: Unknown, probably around 1939
• Identification: Listed in the Classification Horlogère from 1939.
• Country: Switzerland
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)