Pocket Watch Database

We noticed that you entered a relatively short serial number.
"5550" 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:
Rockford Grade Unknown Pocket Watch Movement

Rockford Watch Co.

Grade: Unknown

Original data is missing for this range. Please report information about your watch movement, if known.

Manufacturer: Rockford
Manufacturer Location: Rockford, Illinois
Movement Serial Number: 5550
Grade: Unknown
Model: 1
Estimated Production Year: 1877
Size: 18s
Jewels: 15j
Movement Configuration: Adaptable
Movement Finish: Gilt
Movement Setting: Key
Plate: Full Plate
Data Research: 1907 Rockford Serial List
Database Version: v48.129
Research Note: #5963: Verified as Marked "Rockford Watch Co.; Rockford, Ill. 15 Jewels." Gilt Plates, Model 1. [JH] #5443: Reported as Marked "Extra" and "9 Jewels."

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Data Verification Reports

5001
Verification Serial Map
6000

Anonymous · February 19, 2021

Serial Number 5515 was reported as accurate.

Anonymous · October 23, 2020

Serial Number 5607 was reported as accurate.

Anonymous · October 20, 2020

Serial Number 5607 was reported as accurate.

Bostonwatch 59 · September 4, 2020

Serial Number 5152 was reported as accurate.

esoxhunter Top Contributor Supporter 122 · May 5, 2019

Serial Number 5443 was reported as inaccurate.

Note: Movement 5443 marked "Extra" and "9 Jewels"
Curator Response: Thanks for the report. This information has been noted in the research notes for this run.

shovelhead 65 · April 8, 2019

Serial Number 5275 was reported as accurate.

Anonymous · October 23, 2017

Serial Number 5612 was reported as inaccurate.

Note: 5612 is marked "15 Jewels" on barrel bridge , has
a cutaway balance cock and micro regulator
Changes since this report was submitted:
Jewels changed from 9J to 15j

Anonymous · March 22, 2017

Serial Number 5695 was reported as accurate.

Changes since this report was submitted:
Jewels changed from 9J to 15j

Anonymous · April 9, 2015

Serial Number 5917 was reported as inaccurate.

No further details were submitted with the report.
Changes since this report was submitted:
Jewels changed from 9J to 15j

Anonymous · December 14, 2014

Serial Number 5654 was reported as accurate.

Changes since this report was submitted:
Jewels changed from 9J to 15j

Flyskippy1 29 · February 2, 2014

Serial Number 5183 was reported as inaccurate.

Note: Marked 15 Jewels
Changes since this report was submitted:
Jewels changed from 9J to 15j
Rockford Grade Unknown Pocket Watch Movement