12 size (approx. 17 3/4”’) | Hand Wind | Swiss Lever | Small Seconds |

Remarks:

• Negative crown winding
• Swan-neck fine regulator
• Motor barrel
• Train wheels (fourth wheel, third wheel, center wheel, minute wheel) and chatons (settings) made of gold
• First 12 size movement from Hamilton

• Listing ID: 634
• Manufacturer / Brand: Hamilton
• Caliber: Model 1 Grade 900
• Size in French Lignes: 12 size (approx. 17 3/4''')
• 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: 19
• Setting Lever Screw/Pin Position: None (Negative Winding)
• Balance Position: Left (240 - 360°)
• Shock Protection: None
• Beats per hour: 18,000
• Balance Type: Bimetallic screw balance with Breguet hairspring
• Power Reserve: Unknown
• Production Period: 1910 – 1923 (24.700 pieces)
• Country: U. S. A.
• Identification: Movement marked Hamilton. Based on the serial number on this website: https://pocketwatchdatabase.com/search/result/hamilton/1752940
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)
• External Link: https://uhrforum.de/threads/identifizierte-uhrwerke-die-weder-bei-ranfft-lorenz-noch-im-watch-wiki-zu-finden-sind.86322/page-57#post-7928559
• External Link 2: https://pocketwatchdatabase.com/search/result/hamilton/1752940