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From the American Horology Archive:
Hamilton Watch Co.

Grade: 975

Variant B

Manufacturer: Hamilton ?
Manufacturer Location: Lancaster, Pennsylvania ?
Movement Serial Number: 1278574 ?
Grade: 975 ?
Model: 2 ?
Class: 5 ?
Estimated Production Year: 1918 ?
Run Quantity: 1,000 ?
Grade/Model Run: 15 of 24 ?
Grade/Model Total Production: 21,700 ?
Variant Est. Production: 20,100 (16S-M2-P-N) ?
Size: 16s ?
Jewels: 17j ?
Jewel Setting: Screw-Set ?
Movement Configuration: Hunting ?
Movement Finish: Nickel ?
Movement Setting: Pendant ?
Plate: 3/4 Plate ?
Barrel: Going ?
Regulator: Reed ?
Hairspring: Breguet ?
Adjusted: Yes ?
Adjusted to Position: No ?
Adjusted to Temperature: Yes ?
Railroad Grade: No ?
Dial Feet Locations: 22.3, 38.0, 57.1
Hamilton 16s Dial Feet Research
?
Case: Various ?
Run ID: 1725.975G134.16S997.162M164.H554.P420.17J1036 ?
Data Research: 1953 Hamilton Serial List ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 15 (1.50%) ?