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There are several ways to get an idea of when your watch was made.
I am slowly adding serial number tables to this site. With the exception of BULOVA, the numbers on the inside and outside of the CASE ITSELF are ONLY for identification purposes - they mean nothing.
The company also made precision gauges used for delicate surgical instruments and for radios and other electronic equipment.
During World War II, some watches were still manufactured at the Precision Factory in Switzerland and imported.
A year later, Curvex models for women were introduced.
During World War II, the Time Hill factory stopped making watches and instead worked exclusively for the U. military, manufacturing gauges and instruments for aircraft, ships and submarines.
It was during and shortly after World War II that many American watch companies began to lose market share to Swiss imports.
Many American watch companies began to move manufacturing to Switzerland in the 1940s and 1950s, while Gruen, who had always manufactured watch movements in Germany or Switzerland, launched the '21' series of wristwatches (named for their 21-jewel movements) which were entirely made in the United States.
The building, which still exists, was designed to look like a medieval guild hall.
Many have gone out of business, while others destroyed records to save space.
Some companies (as with the Gruen Watch Company), even lost rocords to fire or other natural disaster. I am sure they had no idea that their timepieces would someday be collected.
many watches spent years in warehouses before being sold... If there are some letters incoroporated in the serial number (common with Hamilton and Elgin) your watch was probably made AFTER the last date on the chart.
Both companies went to a different serial number system and the date of manufacture is not determinable by these letter & number serials.