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

Remarks:

• Negative winding mechanism for US market
• Sav. = Savonnette = hunter movement
• As Ref. 18-28-1 also available as Lépine (open face) movement
• Cam disk regulator

• Listing ID: 10525
• Manufacturer / Brand: Zenith
• Caliber: 18 1/2''' N.V.S.I. sav. / négative Ref. 18-28-2
• 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: Center
• Balance Position: Bottom (120 - 240°)
• Shock Protection: None
• Beats per hour: 18,000
• Balance Type: Bimetallic screw balance with Breguet hairspring
• Power Reserve: Approx. 36 hours
• Production Period: Unknown
• Identification: Listed in the Classification Horlgère from 1936. Design already registered in the Swiss Official Gazette of Commerce in 1904.
• Country: Switzerland
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)