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From the American Horology Archive:
Hamilton Watch Co.

Grade: 948

Variant A

Manufacturer: Hamilton ?
Manufacturer Location: Lancaster, Pennsylvania ?
Movement Serial Number: 981521 ?
Grade: 948 ?
Model: 1 ?
Estimated Production Year: 1914 ?
Run Quantity: 1,000 ?
Grade/Model Run: 2 of 3 ?
Grade/Model Total Production: 1,500 ?
Size: 18s ?
Jewels: 17j ?
Jewel Setting: Screw-Set ?
Movement Configuration: Openface ?
Movement Finish: Nickel ?
Finish Pattern: Damaskeened ?
Movement Setting: Lever ?
Plate: Full Plate ?
Barrel: Going or Motor ?
Regulator: Goldthwait ?
Hairspring: Breguet ?
Pallet Jewel Material: Sapphire ?
Standard Dial Type: Double-Sunk ?
Adjusted: Yes ?
Adjusted to Position: Yes ?
Adjusted # of Positions: 3 ?
Adjusted to Temperature: Yes ?
Adjusted to Isochronism: Yes ?
Dial Feet Locations: 2.6, 18.0, 38.2 ?
Case: Various ?
Run ID: 1457.948G2.18S704.181M452.O930.L973.17J886 ?
Data Research: 1953 Hamilton Serial List ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 40 (4.00%) ?