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:
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Hamilton 934 #40439 Details

Image of Hamilton 934 #40439 Movement
Movement Image

Image of Hamilton 934 #40439 Dial
Dial Image

Image of Hamilton 934 #40439 Case
Case Image

Philadelphia Watch Case Co.
Silverode (nickel alloy) case with cion edge detail on both bezel and case back cover.
private label S.G. Twambley & Son, Biddeford, Me.
Private label dial marked "S.G. Twambley & Son, Biddeford, Maine
"Adjusted", 17 Jewels", "Safety Pinion". and 40430 (ser. no.) stamped on train plate. Private label marked "S.G. Twambley & Son, Biddeford ME" stamped on barrel plate.

This movement has been well cared for over it's 114 year life. Recently tested it in various positions oven a twenty day period and the average error was was only +3.21 seconds per day.