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From the American Horology Archive:
Seth Thomas Watch Co.

Grade: 55

Manufacturer: Seth Thomas ?
Manufacturer Location: Thomaston, Connecticut ?
Movement Serial Number: 10823 ?
Grade: 55 ?
Variation: Type 3 ?
Model: 1 ?
Estimated Production Year: 1886 ?
Run Quantity: 1,500 ?
Grade/Model Run: 3 of 3 ?
Grade/Model Total Production: 2,150 ?
Variant Est. Production: 1,650 (18S-M1-11J-OGL-U-TYPE 3) ?
Size: 18s ?
Jewels: 11j ?
Jewel Setting: Burnished Jewels ?
Movement Configuration: Openface ?
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. Pat'd. Jan.13. & Sept.1. 85. ?
Case: Various ?
Run ID: 10.55G3.18S10.181M10.O10.L10.11J8 ?
Data Research: 1904 Seth Thomas Serial List ?
Database Version: v52.978 ?
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Registry Population: Scoped for This Run Only: 17 (1.13%) ?
Research Note: End Point Based on Material Catalogs. Many of the surviving examples are missing the regulator spring, but the steady and screw holes are still evident to the left side of the regulator arm.