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

Remarks:

• Slightly different setting lever spring than shown in the movement catalogs. The setting lever spring of this movement is probably not original, but was replaced during a repair

 

• Listing ID: 4077
• Manufacturer / Brand: Derby
• Caliber: 33
• Size: 10 1/2'''
• Shape: Round
• Winding: Manual (Crown)
• Hand Setting: Crown
• Seconds Hand: None
• Escapement: Lever (Swiss, English, Glashütte)
• Date & Day: 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: Unknown
• Identification: Listed in the Flume K1 catalog in the 1947 part, in the "Official Catalogue of genuine Swiss Watch repair parts" from 1949 and in the Paulson from 1950.
• External Link: https://uhrforum.de/threads/identifizierte-uhrwerke-die-weder-bei-ranfft-lorenz-noch-im-watch-wiki-zu-finden-sind.86322/page-16#post-2733855
• Country: Switzerland
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)