Pocket Watch Database

We noticed that you entered a relatively short serial number.
"8551" 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:
Cheshire Watch Co. Grade The Cheshire Pocket Watch

Cheshire Watch Co.

Grade: The Cheshire

Manufacturer: Cheshire Watch Co.
Manufacturer Location: Cheshire, Connecticut
Movement Serial Number: 8551
Grade: The Cheshire
Model: Series 1
Estimated Production Year: 1885
Run Quantity: 1,000
Grade/Model Run: 2 of 5
Grade/Model Total Production: 9,300
Size: 20s
Jewels: 4j
Movement Configuration: Hunting
Movement Finish: Gilt
Movement Setting: Pendant
Regulator: Plain
Hairspring: Flat
Railroad Grade: No
Movement Markings: Cheshire Watch Co.
Patented
Cheshire, Conn.
Case: Various
Run ID: 3.G2.20S2.M2.H2.P2.4J2
Database Version: v52.400
Advanced Metrics
PWDB Absolute Rarity Index:
Scoped for Grade/Size/Model/Configuration
28.00
PWDB Relative Rarity Index:
Rarity within Manufacturer - Scoped for Grade/Size/Model/Configuration
97.87
Share of Production:
Share within Manufacturer - Scoped for Grade/Size/Model/Configuration
12.585%
Registry Population:
Scoped for This Run Only
1 (0.10%)

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Cheshire Watch Co. Grade The Cheshire Pocket Watch