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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: 369179 ?
Grade: Keystone Watch Co. ?
Variation: 15J-G ?
Model: 3 ?
Estimated Production Year: 1890 ?
Run Quantity: 5,600 ?
Grade/Model Run: 20 of 41 ?
Grade/Model Total Production: 45,450 ?
Variant Est. Production: 6,600 (18S-M3-15J-G-ADJ) ?
Size: 18s ?
Jewels: 15j ?
Movement Configuration: Hunting ?
Movement Finish: Gilt ?
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 ?
Case: Various ?
Run ID: 162.G55.18S113.183M50.H101.L97.15J41 ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 28 (0.50%) ?
Research Note: #367153: Gilt, Celluloid Dial, #366043: Gilt, Keystone Hands, #366447: Gilt, #368879: Gilt, #364282: Gilt, Keystone Hands, #364885: Gilt, Keystone Hands, #365418: Gilt, Spade Hands, #365086: Keystone Hands, #369179: Gilt Movement, Keystone Hands, #368213: Blue Keystone Hands. #369265: Blue Keystone Hands. #366272: Blue Keystone Hands (Pierced).