16 1/4”’ | Hand Wind | Swiss Lever | Small Seconds |

• Listing ID: 19927
• Manufacturer / Brand: Helvetia / General Watch Co.
• Caliber: 51S I / 51 S I / 51-10
• Size in French Lignes: 16 1/4''' (16'' according to manufacturer)
• Size range mm largest diameter: 31 - 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: Right
• Balance Position: Bottom (120 - 240°)
• Shock Protection: None
• Beats per hour: 18,000
• Balance Type: Monometallic screw balance
• Power Reserve: Unknown
• Production Period: Unknown, probably around 1939
• Country: Switzerland
• Identification: Dial side marked with G. W. Co. 51S I. Listed in the Classification Horlogère from 1939 as Helvetia / General Watch 51-10.
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)