Pocket Watch Database

We noticed that you entered a relatively short serial number.
"7580" 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: Robert Fellows

Private Label(s) in Run:

O.B. Marsh - Broad St. - Newark, N.J.
Bartos & Will Helena Mt.

What is a Private Label?
Manufacturer: Newark Watch Co. Question Mark
Manufacturer Location: Newark, New Jersey Question Mark
Movement Serial Number: 7580 Question Mark
Grade: Robert Fellows Question Mark
Model: 2 Question Mark
Estimated Production Year: 1868 Question Mark
Run Quantity: 100 Question Mark
Grade/Model Run: 1 of 5 Question Mark
Grade/Model Total Production: 500 Question Mark
Variant Est. Production: 200 (18S-M2-15J) Question Mark
Size: 18s Question Mark
Jewels: 15j Question Mark
Jewel Setting: Screw-Set Question Mark
Movement Configuration: Adaptable Question Mark
Movement Finish: Gilt Question Mark
Movement Setting: Key Question Mark
Plate: Full Plate Question Mark
Regulator: Plain Out Question Mark
Hairspring: Flat Question Mark
Movement Markings: Robert Fellows
Patent
Newark, N.J.
Full Jewel'd
Case: Various Question Mark
Run ID: 26.G1.18S19.182M7.E7.K6.15J12 Question Mark
Database Version: v52.431 Question Mark
Advanced Metrics
PWDB Absolute Rarity Index:
Scoped for Grade/Size/Model/Configuration
1.50 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
12.920% Question Mark
Registry Population:
Scoped for This Run Only
6 (6.00%) Question Mark
Research Note: Silver Index

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Verification Reports for this Run

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