Pocket Watch Database

We noticed that you entered a relatively short serial number.
"9240" 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:
Waltham Grade P.S. Bartlett Pocket Watch

American Waltham Watch Co.

Grade: P.S. Bartlett

Manufacturer: Waltham
Manufacturer Location: Waltham, Massachusetts
Movement Serial Number: 9240
Grade: P.S. Bartlett
Model: 1857
Estimated Production Date: April 1858
Run Quantity: 30
Total Production: 293,259
Size: 18s
Jewels: 11j
Movement Configuration: Adaptable
Movement Finish: Gilt
Movement Setting: Key
Plate: Full Plate
Balance Type: Solid
Adjusted: No
Railroad Grade: No
Data Research: c.1900 Waltham Factory Ledgers
1954 Waltham "Gray Book" List
Database Version: v46.738

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Data Verification Reports

9231
Verification Serial Map
9260

Anonymous ยท October 2, 2018

Serial Number 9239 was reported as accurate.

Changes since this report was submitted:
Adjusted changed from Yes to No
Waltham Grade P.S. Bartlett Pocket Watch