Pocket Watch Database

We noticed that you entered a relatively short serial number.
"5721" 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:
New York Watch Co. Grade John L. King Pocket Watch

New York Watch Co.

Grade: John L. King

Private Label(s) in Run:

A.J. Robinson - Providence, R.I.
Benedict Bros. - 171 Broadway - New York

What is a Private Label?
Manufacturer: New York Watch Co.
Manufacturer Location: Springfield, Massachusetts
Movement Serial Number: 5721
Grade: John L. King
Model: 1869
Estimated Production Year: 1870
Run Quantity: 150
Grade/Model Run: 5 of 9
Grade/Model Total Production: 775
Size: 18s
Jewels: 17j
Jewel Material: Ruby
Jewel Setting: Screw-Set
Movement Configuration: Adaptable
Movement Finish: Gilt
Movement Setting: Key
Plate: 3/4 Plate
Regulator: Plain
Hairspring: Flat
Standard Dial Type: Single-Sunk
Adjusted: Yes
Adjusted to Temperature: Yes
Movement Markings: John L. King
Springfield, Mass.
Case: Various
Run ID: 27.G5.18S16.181869M16.E16.K18.17J5
Database Version: v52.304
Advanced Metrics
PWDB Absolute Rarity Index:
Scoped for Grade/Size/Model/Configuration
2.33
PWDB Relative Rarity Index:
Rarity within Manufacturer - Scoped for Grade/Size/Model/Configuration
51.34
Share of Production:
Share within Manufacturer - Scoped for Grade/Size/Model/Configuration
1.592%
Registry Population: 7 (4.67%)

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New York Watch Co. Grade John L. King Pocket Watch