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From the American Horology Archive:
Hamilton Watch Co.

Grade: 946

Variant A

Manufacturer: Hamilton ?
Manufacturer Location: Lancaster, Pennsylvania ?
Movement Serial Number: 442334 ?
Grade: 946 ?
Model: 1 ?
Estimated Production Year: 1905 ?
Run Quantity: 400 ?
Grade/Model Run: 4 of 15 ?
Grade/Model Total Production: 10,692 ?
Size: 18s ?
Jewels: 23j ?
Jewel Material: Ruby & Sapphire ?
Jewel Setting: Gold Settings (Screw-Set) ?
Movement Configuration: Openface ?
Movement Finish: Nickel ?
Movement Inlay Color: Gilt ?
Movement Setting: Lever ?
Plate: Full Plate ?
Barrel: Motor ?
Regulator: Goldthwait ?
Hairspring: Breguet ?
Pallet Jewel Material: Sapphire ?
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: 931.946G4.18S480.181M270.O520.L567.23J4 ?
Data Research: 1953 Hamilton Serial List ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 15 (3.75%) ?