18 1/2”’ | Hand Wind | Swiss Lever | Small Seconds |

Remarks:

• Negative winding mechanism
• Bridge forms differ from orignal Zenith movement

• Listing ID: 2218
• Manufacturer / Brand: Zenith / Alpina
• Caliber: Alpina 3811 = Zenith 18-28-3T
• Size in French Lignes: 18 1/2'''
• Size range mm largest diameter: > 40 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: None (Negative Winding)
• Balance Position: Right (0 - 120°)
• Shock Protection: None
• Beats per hour: 18,000
• Balance Type: Bimetallic screw balance
• Power Reserve: Unknown
• Production Period: Unknown
• Country: Switzerland
• Identification: Movement marked Alpina 3811. As Zenith listed in the Classification Horlogère 1936.
• Contributor ©: Uhrforum.de member Cougarnaut
• External Link: https://uhrforum.de/threads/identifizierte-uhrwerke-die-weder-bei-ranfft-lorenz-noch-im-watch-wiki-zu-finden-sind.86322/page-40#post-5207198