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The reason: There have been a lot of watch manufacturing companies that have come and gone over the years.
Many have gone out of business, while others destroyed records to save space.
These numbers are stamped on the back (outside) of the case. The code was usually stamped on the back of the watch case.
Both companies went to a different serial number system and the date of manufacture is not determinable by these letter & number serials.
: In the 1950's Bulova incorporated a symbol system to date the watches they manufactured.
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.
Serial number records are available for many of the old pocket watch companies like AM Waltham, Elgin, South Bend etc. The number you need is the serial number stamped on the MOVEMENT (i.e the inner workings).
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.
There are several ways to get an idea of when your watch was made.