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From the American Horology Archive:
Hamilton Watch Co.

Grade: 994

Manufacturer: Hamilton ?
Manufacturer Location: Lancaster, Pennsylvania ?
Movement Serial Number: 1155346 ?
Grade: 994 ?
Model: 3 ?
Estimated Production Year: 1919 ?
Run Quantity: 300 ?
Grade/Model Run: 5 of 5 ?
Grade/Model Total Production: 1,200 ?
Variant Est. Production: 800 (16S-M3-L) ?
Size: 16s ?
Jewels: 21j ?
Jewel Material: Ruby & Sapphire ?
Jewel Setting: Gold Settings (Screw-Set) ?
Movement Configuration: Openface ?
Movement Finish: Nickel ?
Movement Setting: Lever ?
Plate: Bridge Plate ?
Bridge Type: Center ?
Barrel: Going or Motor ?
Train Material: Gold ?
Center Wheel Material: Gold ?
Regulator: Reed ?
Hairspring: Breguet ?
Pallet Jewel Material: Sapphire ?
Adjusted: Yes ?
Adjusted to Position: Yes ?
Adjusted # of Positions: 5 ?
Adjusted to Temperature: Yes ?
Adjusted to Isochronism: Yes ?
Railroad Grade: No ?
Dial Feet Locations: 22.3, 38.0, 57.1
Hamilton 16s Dial Feet Research
?
Case: Various ?
Run ID: 1622.994G5.16S901.163M56.O1072.L1086.21J459 ?
Data Research: 1953 Hamilton Serial List ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 10 (3.33%) ?