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From the American Horology Archive:
Hamilton Watch Co.

Grade: 993

["Variant A","Variant C"]

Manufacturer: Hamilton ?
Manufacturer Location: Lancaster, Pennsylvania ?
Movement Serial Number: 367531 ?
Grade: 993 ?
Model: 1 ?
Estimated Production Year: 1907 ?
Run Quantity: 500 ?
Grade/Model Run: 26 of 30 ?
Grade/Model Total Production: 11,480 ?
Variant Est. Production: 8,680 (16S-M1-L) ?
Size: 16s ?
Jewels: 21j ?
Jewel Material: Ruby & Sapphire ?
Jewel Setting: Gold Settings (Screw-Set) ?
Movement Configuration: Hunting ?
Movement Finish: Nickel ?
Movement Setting: Lever ?
Plate: 3/4 Plate ?
Barrel: Going or Motor ?
Center Wheel Material: Gold ?
Regulator: Reed ?
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: 7.6, 21.8, 38.0, 50.5
Hamilton 16s Dial Feet Research
?
Case: Various ?
Run ID: 829.993G6.16S380.161M346.H389.L486.21J191 ?
Data Research: 1953 Hamilton Serial List ?
Database Version: v52.978 ?
Advanced Metrics
Members Only Data. Login or create a free account to unlock.
Registry Population: Scoped for This Run Only: 11 (2.20%) ?
$ Estimated Value (12 Month Change): -4.60% Analyzing 299 Sales ?
Research Note: Some movements in run finished with a two-tone finish.