Many watch companies made hundreds of thousands of watches, and some companies made millions of watches!It would be impractical to list the individual serial numbers of EVERY watch made... Our serial number tables list RANGES of serial numbers.
It's the positional adjustment and the temperature adjustment that sets this watch apart from many others made in the 1940's.
Adjustment for isochronism means that the watch runs with the same rate independent of whether the watch if fully wound or almost unwound.
This page contains INSTRUCTIONS for using the serial number look-up tables that are found on many of our watch company history pages.
The example below uses information from the American Waltham Watch Company, but that is just an example.
You should consult the serial number table for the specific brand of watch movement you are trying to date by selecting a company from the menu on the left.
Not all vintage watches can be dated using the serial number.These railways had a single track for both directions and two trains running in opposite direction could pass each other at railway stations and other places which had two tracks, one for each direction, for a short distance only. Ball's career eventually led to him being the time inspector on more than half the United States' railways, leading to a far more uniform set of standards across the US.He gave a very interessting interview in the New-York Tribune January 16, 1910 (Many lives sacrificed because of faulty watches, interview with Webb C. An interesting question from a historic point of view is of course: why did nobody in North America come up with any solution other than time keeping?Some American watch brands did not use a consistent series of serial numbers, but most of the big manufacturers did.Most vintage Swiss pocket watches did NOT have serial numbers and can't be dated by this method.Note that we're using the serial number from the watch movement, not from the watch case.