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From the American Horology Archive:
Lancaster Watch Co.

Grade: Keystone Watch Co.

Manufacturer: Lancaster Watch Co. ?
Manufacturer Location: Lancaster, Pennsylvania ?
Movement Serial Number: 354169 ?
Grade: Keystone Watch Co. ?
Variation: 15J-GD ?
Model: 3 ?
Estimated Production Year: 1890 ?
Run Quantity: 500 ?
Grade/Model Run: 13 of 41 ?
Grade/Model Total Production: 45,450 ?
Variant Est. Production: 5,200 (18S-M3-15J-G-ADJ) ?
Size: 18s ?
Jewels: 15j ?
Movement Configuration: Hunting ?
Movement Finish: Gilt Damaskeened ?
Movement Setting: Lever ?
Plate: 3/4 Plate ?
Train: Quick ?
Regulator: Bitner ?
Adjusted: Yes ?
Movement Markings: Keystone Watch Co. Pat. Dust Proof. Safety Pinion Pat. S.W. Adjusted Pat. Reg. ?
Case: Various ?
Run ID: 154.G47.18S105.183M43.H93.L89.15J34 ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 4 (0.80%) ?
Research Note: #353089: Celluloid Dial with Keystone Hands, #354474: Standard Dial, Keystone Hands