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

Remarks:

• Vibraflex (see inscription on the barrel bridge) is the name for a special form of balance wheel (extra picture)

• Listing ID: 3365
• Manufacturer / Brand: Buser
• Caliber: 310
• 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: Sweeping seconds (central seconds)
• Escapement: Lever (Swiss, English, Glashütte)
• Date, Day, Month...: None
• Jewels: 17
• Setting Lever Screw/Pin Position: Left
• Balance Position: Bottom (120 - 240°)
• Shock Protection: None
• Beats per hour: 18,000
• Balance Type: Nickel
• Power Reserve: Unknown
• Production Period: Unknown, probably around 1960
• Identification: Barrel bridge marked with the Buser logo and 310. Listed in the Flume K2 catalog of 1962, but without illustration.
• External Link: https://uhrforum.de/threads/identifizierte-uhrwerke-die-weder-bei-ranfft-lorenz-noch-im-watch-wiki-zu-finden-sind.86322/page-25#post-3609170
• Country: Switzerland
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)