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From the American Horology Archive:
Seth Thomas Watch Co.

Grade: 56

Manufacturer: Seth Thomas ?
Manufacturer Location: Thomaston, Connecticut ?
Movement Serial Number: 39457 ?
Grade: 56 ?
Model: 2 ?
Estimated Production Year: 1888 ?
Run Quantity: 600 ?
Grade/Model Run: 2 of 13 ?
Grade/Model Total Production: 3,700 ?
Variant Est. Production: 3,500 (18S-M2-11J) ?
Size: 18s ?
Jewels: 11j ?
Jewel Setting: Burnished Jewels ?
Movement Configuration: Hunting ?
Movement Finish: Gilt ?
Movement Setting: Lever ?
Plate: 3/4 Plate ?
Balance Type: Expansion ?
Regulator: Reed ?
Hairspring: Flat ?
Standard Dial Type: Single-Sunk ?
Adjusted: No ?
Railroad Grade: No ?
Movement Markings: Seth Thomas Thomaston, Conn. Safety Pinion Pat'd Dec.6.'87. ?
Case: Various ?
Run ID: 62.56G2.18S62.182M16.H16.L60.11J18 ?
Data Research: 1904 Seth Thomas Serial List ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 6 (1.00%) ?