5 x 7 1/4”’ | Hand Wind | Swiss Lever | No Seconds |

Remarks:

• Movement family:
• Zenith 57: 18,000 bph, no shock protection
• Zenith 57.8: 21,600 bph, no shock protection
• Zenith 57.8-6: 21,600 bph, Incabloc shock protection

• Listing ID: 10025
• Manufacturer / Brand: Zenith
• Caliber: 57.8
• Size in French Lignes: 5 x 7 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: 21,600
• Balance Type: Monometallic screw balance
• Power Reserve: Unknown
• Production Period: 1951 – 1956
• Country: Switzerland
• Identification: Movement marked with ZENITH and 57.8.
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)
• External Link 2: https://watch-movements.eu/blog/en/2020/10/03/zenith-movements-in-display-watch-cases/