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

Remarks:

• Old version: without setting lever spring
• New version: with setting lever spring

• Listing ID: 5116
• Manufacturer / Brand: Felsa / ZentRa
• Caliber: ZentRa 51A = Felsa 71 new
• 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: Small seconds
• 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: Bimetallic screw balance
• Power Reserve: Unknown
• Production Period: Unknown, probably around 1928.
• Identification: Marked with ZentRa 51A. Listed in the Ebauches SA catalog from 1928.
• External Link: https://uhrforum.de/threads/identifizierte-uhrwerke-die-weder-bei-ranfft-lorenz-noch-im-watch-wiki-zu-finden-sind.86322/#post-1119453
• Country: Switzerland
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)