Pocket Watch Database

We noticed that you entered a relatively short serial number.
"5423" 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:

Newark Watch Co.

Grade: Arthur Wadsworth

Manufacturer: Newark Watch Co. Question Mark
Manufacturer Location: Newark, New Jersey Question Mark
Movement Serial Number: 5423 Question Mark
Grade: Arthur Wadsworth Question Mark
Model: 1 Question Mark
Estimated Production Year: 1868 Question Mark
Run Quantity: 30 Question Mark
Grade/Model Run: 7 of 11 Question Mark
Grade/Model Total Production: 860 Question Mark
Size: 18s Question Mark
Jewels: 15j Question Mark
Jewel Setting: Screw-Set Question Mark
Movement Configuration: Hunting Question Mark
Movement Finish: Gilt Question Mark
Movement Setting: Lever Question Mark
Plate: Full Plate Question Mark
Regulator: Plain Out Question Mark
Hairspring: Flat Question Mark
Movement Markings: Arthur Wadsworth
Newark, N.J.
Patented June 19, 1866
Feb. 11, 1868
Case: Various Question Mark
Run ID: 13.G7.18S9.181M8.H8.L8.15J7 Question Mark
Database Version: v52.431 Question Mark
Advanced Metrics
PWDB Absolute Rarity Index:
Scoped for Grade/Size/Model/Configuration
2.59 Question Mark
PWDB Relative Rarity Index:
Rarity within Manufacturer - Scoped for Grade/Size/Model/Configuration
190.00 Question Mark
Share of Production:
Share within Manufacturer - Scoped for Grade/Size/Model/Configuration
22.222% Question Mark
Registry Population:
Scoped for This Run Only
1 (3.33%) Question Mark
Research Note: #5423: Paired with case inscribed with the date May 25, 1872 [JH].

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