Enter the serial number from the pocket watch movement below. Do not use the case number. Tips for looking up your watch

How to Find Info About Your Pocket Watch

The Pocket Watch Database has compiled data covering the major American pocket watch manufacturers and created an easy way to find information using the serial number on the watch movement. Here are a few tips to find information about your pocket watch:

  1. Always input the serial number from the pocket watch movement (the "mechanism" of the watch).
  2. Never use the serial number from the case or any other part.
  3. Always select the correct manufacturer, which is usually stamped on the watch movement or dial.
  4. If the manufacturer is not listed on the site, you may have a "private label" watch or it may not be American-made.
  5. If the serial number includes a letter, enter it along with the number when using the lookup feature.
  6. Many pocket watch case backs screw off. Others may require a dull wide blade to pry or pop the cover. Be careful not to scratch or damage the movement.
  7. Consider uploading images of your watch by creating a collection account on the website. This is compeltely free and assists in promoting research in American horology.
  8. Understand that many companies did not keep accurate or complete records. As a result, information displayed on this site may have inaccuracies. This is to be expected, and we have included an option to report inaccurate information on the result pages so the database can be continually improved.
Pocket Watch Serial Number Lookup - Hamilton, South Bend, Illinois, Rockford, Waltham & Elgin Pocket Watches
  Serial Number:
Need to replace a watch crystal? Use our new crystal size guide to find the proper fit.

Grade: 940

Manufacturer: Hamilton
Manufacturer Location: Lancaster, Pennsylvania
Movement Serial Number: 158631
Grade: 940
Model: 1
To Finishing Dept: Apr 19, 1901
Run Quantity: 1,000
Total Production: 210,596
Size: 18s
Jewels: 21j
Jewel Material: Ruby
Jewel Setting: Screw-Set
Movement Configuration: Openface
Movement Finish: Nickel
Finish Pattern: Damaskeened
Movement Inlay Color: Gilt
Movement Setting: Lever
Plate: Full Plate
Barrel: Going
Regulator: Goldthwait
Hairspring: Breguet
Standard Dial Type: Double-Sunk
Adjusted: Yes
Adjusted to Position: Yes
Adjusted # of Positions: 5
Adjusted to Temperature: Yes
Adjusted to Isochronism: Yes
Railroad Grade: Yes
Dial Feet Locations: 2.6, 18.0, 38.2
U.S. Patents: 832672, 427072
Data Research: 1953 Hamilton Serial List
Help us improve the database: Does this info describe your movement accurately?
Why Might This Information Be Incorrect?
Thanks for your help!
We have received your verification.

Data Confidence Rating:

Verifications & Observations

Verification Serial Map
  • February 20, 2020:
    Serial Number 158320 was reported as accurate
  • November 13, 2019:
    Serial Number 158035 was reported as accurate
  • March 18, 2018:
    Serial Number 158589 was reported as accurate
  • October 5, 2016:
    Serial Number 158761 was reported as accurate
  • August 11, 2016:
    Serial Number 158467 was reported as accurate
  • March 4, 2016:
    Serial Number 158675 was reported as accurate
  • April 7, 2015:
    Serial Number 158631 was reported as accurate
  • February 26, 2015:
    Serial Number 158631 was reported as accurate
  • February 8, 2015:
    Serial Number 158678 was reported as accurate
  • June 5, 2014:
    Serial Number 158993 was reported as accurate
  • May 11, 2014:
    Serial Number 158556 was reported as accurate
  • May 10, 2014:
    Serial Number 158555 was reported as accurate
  • April 28, 2014:
    Serial Number 158526 was reported as accurate
  • October 16, 2013:
    Serial Number 158281 was reported as accurate
  • June 7, 2012:
    Serial Number 158548 was reported as accurate