5 1/4 x 6 3/4”’ | Hand Wind | Swiss Lever | No Seconds |

Remarks:

• Smallest IWC movement

• Listing ID: 8142
• Manufacturer / Brand: IWC
• Caliber: 431
• Size in French Lignes: 5 1/4 x 6 3/4''' (4 3/4'' according to manufacturer)
• Size range mm largest diameter: 0 - 22 mm
• Shape: Form
• Winding: Manual (Crown)
• Hands Setting: Crown
• Seconds Hand: None
• Escapement: Lever (Swiss, English, Glashütte)
• Date, Day, Month...: None
• Jewels: 17
• Setting Lever Screw/Pin Position: Right
• Balance Position: Right (0 - 120°)
• Shock Protection: Incabloc
• Beats per hour: 19,800
• Balance Type: Monometallic screw balance
• Power Reserve: Unknown
• Production Period: Unknown, probably around 1959+
• Identification: Dial side marked with IWC logo. Barrel bridge marked with C 431. Listed in a supplement from 1959 to the "Official Catalogue of genuine Swiss Watch repair parts".
• Country: Switzerland
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)