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From the American Horology Archive:
Hamilton Watch Co.

Grade: 922MP

Variant B, Fits Unique Hamilton Case

Manufacturer: Hamilton ?
Manufacturer Location: Lancaster, Pennsylvania ?
Movement Serial Number: 3012452 ?
Grade: 922MP ?
Model: 2 ?
Estimated Production Year: 1929 ?
Run Quantity: 600 ?
Grade/Model Run: 6 of 7 ?
Grade/Model Total Production: 2,600 ?
Size: 12s ?
Jewels: 23j ?
Jewel Material: Ruby ?
Jewel Setting: Gold Settings (Screw-Set) ?
Movement Configuration: Openface ?
Movement Finish: Nickel ?
Finish Pattern: Circular ?
Movement Signing Style: Serif (Decorative) ?
Movement Inlay Color: Gilt ?
Movement Setting: Pendant ?
Plate: Bridge Plate ?
Bridge Type: Center ?
Barrel: Motor ?
Train 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: 10.5, 38.5, 56.0 ?
Movement Markings: Hamilton Masterpiece Adjusted 5 Positions 23 Jewels Lancaster, Pa. ?
Case: Various ?
Run ID: 2321.G6.12S113.122M13.O1705.P704.23J78 ?
Data Research: 1953 Hamilton Serial List ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 12 (2.00%) ?