Pocket Watch Database

We noticed that you entered a relatively short serial number.
"20" 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.

Due to the lack of existing factory records, our U.S. Watch Co. (Waltham, Mass) database has been reconstructed using observations of known watches.
As a result, the information may contain inaccuracies. Please let us know if you have details that can improve the database.

From the American Horology Archive:
U.S. Watch Co. (Waltham, Mass) Grade Dome Pocket Watch

U.S. Watch Co. (Waltham, Mass)

Grade: Dome

Manufacturer: U.S. Watch Co. (Waltham, Mass)
Manufacturer Location: Waltham, Massachusetts
Movement Serial Number: 20
Grade: Dome
Model: 1885
Estimated Production Year: 1887
Run Quantity: 50
Grade/Model Run: 1 of 3
Grade/Model Total Production: 5,750
Size: 16s
Jewels: 7j
Movement Configuration: Openface
Movement Finish: Gilt
Movement Setting: Pendant
Plate: Full Plate
Balance Type: Expansion
Regulator: Plain
Hairspring: Flat
Adjusted: No
Railroad Grade: No
Movement Markings: U.S. Watch Co.
Waltham, Mass.
Chas. W. Woerd's
Patents
Case: Various
Run ID: 1.G1.16S1.161885M1.O1.P1.7J1
Database Version: v52.219
Advanced Metrics
PWDB Absolute Rarity Index:
Scoped for Grade/Size/Model/Configuration
17.21
PWDB Relative Rarity Index:
Rarity within Manufacturer - Scoped for Grade/Size/Model/Configuration
117.38
Share of Production:
Share within Manufacturer - Scoped for Grade/Size/Model/Configuration
1.719%
Registry Population: 1 (2.00%)

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U.S. Watch Co. (Waltham, Mass) Grade Dome Pocket Watch