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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.

Waltham Grade No. 645 Research

Waltham Grade No. 645 Advertisement from 1915

Dearborn Watch & Clock Co. Catalog

Publication Date: c. 1915

Page: 92

Grade:No. 645
Manufacturer:Waltham
Size:16s
Configuration:Openface
Setting:Lever
Finish:Nickel
Jewels:21j
Jewel Count Marked:Yes
Jewel Setting:Screw-set
Jewel Description:21 Fine Ruby and Sapphire Jewels, Settings
Adjusted:Yes
Adjusted Marked:Yes
Adjusted To Temperature:Yes
Adjusted To Isochronism:Yes
Adjusted # Positions:5
Adjusted Description:Adjusted to Temperature, Isochronism and Five Positions
Railroad Grade:Yes
Regulator:Patent Micrometric Regulator
Hairspring:Breguet
Balance:Compensation
Markings:645
A.W.W.Co
Waltham, Mass.
21 Jewels
Adjusted
5 Positions
Movement Font Style:Mixed
Dial Type:Double-sunk
Description:16 Size Waltham No. 645
21 Jewel Nickel Movement
21 fine ruby and sapphire jewels, settings, adjusted to termperature, isochronism and five positions, compensating balance, patent Breguet hairspring, hardedned and tempered in form, double roller escapement, sapphire jewel pin permanently driven into the roller, exposed micrometric regulator, tempered steel safety barrel, jeweled main wheel bearings, exposed winding wheels, double-sunk dial.
No. 1724 Open face style only, lever set. $59.25
(This movement not made in huning style).
Price:$59.25
Waltham Grade No. 645 Advertisement from 1915

P.W. Ellis & Co. Illustrated Catalogue

Publication Year: 1915

Page: 27

Grade:No. 645
Manufacturer:Waltham
Size:16s
Jewels:21j
Adjusted:Yes
Adjusted Marked:Yes
Adjusted # Positions:5
Railroad Grade:Yes
Description:No. 645
21 Jewels
16 Size Only
$32.00
Price:$32.00