16 1/2”’ | Hand Wind | Swiss Lever | Small Seconds |

Remarks:

• Movement family:
  • Unitas 285: Lépine (open face) movement
  • Unitas 497: Lépine (open face) movement, different bridge design
  • Unitas 498: Savonnette (hunter) movement
  • Unitas 6500: Lépine (open face) movement, date with quick-setting
• Predecessor of the Unitas 6497 / 6498

• Listing ID: 20649
• Manufacturer / Brand: Unitas
• Caliber: Unitas 497
• Size in French Lignes: 16 1/2'''
• 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: 17
• Setting Lever Screw/Pin Position: Left
• Balance Position: Right (0 - 120°)
• Shock Protection: None
• Beats per hour: 18,000
• Balance Type: Monometallic screw balance
• Power Reserve: Approx. 40 hours
• Production Period: Unknown, probably around 1950+
• Country: Switzerland
• Identification: Movement marked with Unitas logo and 497 under the balance wheel. Original datasheet from 1963 available. Listed in the Ebauches SA catalog from 1950.
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)