Pocket Watch Database

We noticed that you entered a relatively short serial number.
"240" 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:

Auburndale Watch Co.

Grade: Rotary

Manufacturer: Auburndale Watch Co. Question Mark
Manufacturer Location: Auburdale, Massachusetts Question Mark
Movement Serial Number: 240 Question Mark
Grade: Rotary Question Mark
Variation: Standard Lever Question Mark
Model: Rotary Question Mark
Estimated Production Year: 1878 Question Mark
Run Quantity: 80 Question Mark
Grade/Model Run: 3 of 7 Question Mark
Grade/Model Total Production: 295 Question Mark
Variant Est. Production: 160 (18S-MROTARY-5J-ONL-U-STANDARD LEVER) Question Mark
Size: 18s Question Mark
Jewels: 5j Question Mark
Movement Configuration: Openface Question Mark
Movement Finish: Nickel Question Mark
Movement Setting: Lever Question Mark
Regulator: Plain Question Mark
Hairspring: Flat Question Mark
Railroad Grade: No Question Mark
Movement Markings: Auburndale Rotary
Mass
Patents
Mar. 30. 1875
July 20. 1875
June 20. 1876
Jan. 30 1877
Case: Various Question Mark
Run ID: 7.G3.18S5.M3.O4.L4.5J4 Question Mark
Database Version: v52.431 Question Mark
Advanced Metrics
PWDB Absolute Rarity Index:
Scoped for Grade/Size/Model/Configuration
0.89 Question Mark
PWDB Relative Rarity Index:
Rarity within Manufacturer - Scoped for Grade/Size/Model/Configuration
100.00 Question Mark
Share of Production:
Share within Manufacturer - Scoped for Grade/Size/Model/Configuration
7.320% Question Mark
Registry Population:
Scoped for This Run Only
4 (5.00%) Question Mark
Research Note: #362: Pictured in the 1978 Price Indicator as an early "Timer" (not Rotary). However, it is possible the serial number is actually #862.

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