Pocket Watch Database

We noticed that you entered a relatively short serial number.
"1257" could possibly indicate the grade of the watch and not the serial number of your movement. Serial numbers are usually more than a few digits.
From the American Horology Archive:
Seth Thomas Grade 55 Pocket Watch

Seth Thomas Watch Co.

Grade: 55

Manufacturer: Seth Thomas
Manufacturer Location: Thomaston, Connecticut
Movement Serial Number: 1257
Grade: 55
Model: 1
Estimated Production Year: 1885
Run Quantity: 1,000
Grade/Model Run: 1 of 2
Grade/Model Total Production: 2,500
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
U.S. Patents: 310865, 325568
Movement Markings: Seth Thomas
Thomaston, Conn.
Jan.13, & Sept.1. 85.
Case: Various
Run ID: 3.55G1.18S3.181M3.O3.L3.11J3
Database Version: v51.870
Advanced Metrics
PWDB Absolute Rarity Index:
Scoped for Grade/Size/Model/Configuration
PWDB Relative Rarity Index:
Rarity within Manufacturer - Scoped for Grade/Size/Model/Configuration
Share of Production:
Share within Manufacturer - Scoped for Grade/Size/Model/Configuration
Registry Population: 1 (0.10%)

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Verification Reports for this Run

The following reports have been graciously submitted by dedicated members in reference to this production run. These reports are useful to verify data and track inaccuracies that require further research. Please note that reports may contain inaccurate information or assumptions that must be dilligently considered with other available sources.

SethThomasFan Top Contributor Seth Thomas Expert Supporter 246 ยท December 14, 2022

Serial Number 1257 was reported as accurate.

Seth Thomas Grade 55 Pocket Watch