10 1/2”’ | Hand Wind | Swiss Lever | No Seconds

• Listing ID: 3324
• Manufacturer / Brand: Arogno
• Caliber: 34
• Size in French Lignes: 10 1/2'''
• Size range mm largest diameter: 22 - 31 mm
• Shape: Round
• Winding: Manual (Crown)
• Hands Setting: Crown
• Escapement: Lever (Swiss, English, Glashütte)
• Date, Day, Month...: None
• Jewels: 15
• Setting Lever Screw/Pin Position: Left
• Balance Position: Bottom (120 - 240°)
• Shock Protection: None
• Beats per hour: 18,000
• Balance Type: Monometallic screw balance
• Power Reserve: Unknown
• Production Period: Probably between 1936 and 1939, because TR hallmark from 1936 and new Arogno logo from 1939.
• Identification: Dial side with old Arogno logo and TR mark of Ebauches SA. Shown in the Classification Horlogère of 1936 and in the Flume K1 catalog with a different bridge side and a different lever spring. The SWISSCO Quick-Check (ca. 1960) lists both the variant of the setting lever spring shown here and the one from the Classification.
• External Link: https://uhrforum.de/threads/identifizierte-uhrwerke-die-weder-bei-ranfft-lorenz-noch-im-watch-wiki-zu-finden-sind.86322/page-26#post-3636844
• Country: Switzerland
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)