The square dating Daniell wagner sex chat
These numbers are stamped on the back (outside) of the case. The code was usually stamped on the back of the watch case.
If there is no two symbols, it could be that your watch was made before 1948. For exabple, If you have a Bulova watch with the stamp M3 then it was made in 1963.
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.
Dials were larger while the cases were made to be less of a focal point...