5 3/4”’ x 8 3/4”’ | Hand Wind | Swiss Lever | No Seconds |

Remarks:

• The Flume K1 catalog lists three variants (I, II, III) of the caliber 52, which differ in their setting lever springs
• In both movements of this caliber that I have, the setting lever spring is defective. This therefore appears to be vulnerable
• There is also a variant of the Felsa 52 II with round instead of straight edges

• Listing ID: 5126
• Manufacturer / Brand: Felsa
• Caliber: 52 I
• Size in French Lignes: 5 3/4''' x 8 3/4''' (according to the manufacturer: 5 1/4''')
• 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: 15
• Setting Lever Screw/Pin Position: Right
• Balance Position: Right (0 - 120°)
• Shock Protection: None
• Beats per hour: 18,000
• Balance Type: Bimetallic screw balance
• Power Reserve: Unknown
• Production Period: Unknown, probably around 1928
• Country: Switzerland
• Identification: Variant I listed in the Ebauches SA catalog from 1928.
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)
• External Link: https://uhrforum.de/threads/identifizierte-uhrwerke-die-weder-bei-ranfft-lorenz-noch-im-watch-wiki-zu-finden-sind.86322/#post-1119453