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From the American Horology Archive:
Hamilton Watch Co.

Grade: 940

Variant A

Manufacturer: Hamilton ?
Manufacturer Location: Lancaster, Pennsylvania ?
Movement Serial Number: 941490 ?
Grade: 940 ?
Model: 1 ?
Estimated Production Year: 1912 ?
Run Quantity: 3,000 ?
Grade/Model Run: 105 of 121 ?
Grade/Model Total Production: 210,596 ?
Variant Est. Production: 209,696 (18S-M1-N) ?
Size: 18s ?
Jewels: 21j ?
Jewel Material: Ruby ?
Jewel Setting: Gold Settings (Screw-Set) ?
Movement Configuration: Openface ?
Movement Finish: Nickel ?
Finish Pattern: Damaskeened ?
Movement Inlay Color: Gilt ?
Movement Setting: Lever ?
Plate: Full Plate ?
Double Roller: Yes ?
Barrel: Motor ?
Regulator: Goldthwait ?
Hairspring: Breguet ?
Standard Dial Type: Double-Sunk ?
Adjusted: Yes ?
Adjusted to Position: Yes ?
Adjusted # of Positions: 5 ?
Adjusted to Temperature: Yes ?
Adjusted to Isochronism: Yes ?
Railroad Grade: Yes ?
Dial Feet Locations: 2.6, 18.0, 38.2 ?
Case: Various ?
Run ID: 1440.940G105.18S687.181M436.O914.L956.21J396 ?
Data Research: 1953 Hamilton Serial List ?
Database Version: v52.978 ?
Advanced Metrics
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Registry Population: Scoped for This Run Only: 46 (1.53%) ?
$ Estimated Value (12 Month Change): +9.35% Analyzing 3,839 Sales ?