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. Question Mark
Manufacturer Location: Springfield, Massachusetts Question Mark
Movement Serial Number: 5721 Question Mark
Grade: John L. King Question Mark
Model: 1869 Question Mark
Estimated Production Year: 1870 Question Mark
Run Quantity: 150 Question Mark
Grade/Model Run: 5 of 9 Question Mark
Grade/Model Total Production: 775 Question Mark
Size: 18s Question Mark
Jewels: 17j Question Mark
Jewel Material: Ruby Question Mark
Jewel Setting: Screw-Set Question Mark
Movement Configuration: Adaptable Question Mark
Movement Finish: Gilt Question Mark
Movement Setting: Key Question Mark
Plate: 3/4 Plate Question Mark
Regulator: Plain Question Mark
Hairspring: Flat Question Mark
Standard Dial Type: Single-Sunk Question Mark
Adjusted: Yes Question Mark
Adjusted to Temperature: Yes Question Mark
Movement Markings: John L. King
Springfield, Mass.
Case: Various Question Mark
Run ID: 27.G5.18S16.181869M16.E16.K18.17J5 Question Mark
Database Version: v52.528 Question Mark
Advanced Metrics
PWDB Absolute Rarity Index:
Scoped for Grade/Size/Model/Configuration
2.33 Question Mark
PWDB Relative Rarity Index:
Rarity within Manufacturer - Scoped for Grade/Size/Model/Configuration
51.34 Question Mark
Share of Production:
Share within Manufacturer - Scoped for Grade/Size/Model/Configuration
1.585% Question Mark
Registry Population:
Scoped for This Run Only
7 (4.67%) Question Mark

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