18 1/2”’ | Hand Wind | Swiss Lever | Small Seconds |

Remarks:

• Movement family (all movements available with 18 1/2 and 19”’):
  • Unitas 231: small seconds, height 5.30 mm
  • Unitas 233: small seconds, height 4.15 mm
  • Unitas 426-1: sweeping seconds
  • Unitas 429: small seconds, height 6.50 mm
  • Unitas 431: small seconds, height 4.70 mm

• Listing ID: 13265
• Manufacturer / Brand: Unitas
• Caliber: 231
• Size in French Lignes: 18 1/2'''
• Size range mm largest diameter: > 40 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: Right (0 - 120°)
• Shock Protection: Incabloc
• Beats per hour: 18,000
• Balance Type: Monometallic screw balance
• Power Reserve: Unknown
• Production Period: Unknown, probably around 1949
• Country: Switzerland
• Identification: Movement marked with Unitas logo UT and 231 under the balance wheel. Listed in the "Official Catalogue of genuine Swiss Watch repair parts" from 1949.
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)