Dating telecaster pickups
Determining the date can also be important from a collector’s perspective, since the pre-1966 vintage Fender guitars are generally considered the most valuable.
Fender was sold to CBS in the first week of January 1965, but already in late 1964 mass production was slowly being introduced, which gradually lowered quality and ultimately collectibility.
Finally, the first one or two digits of the code tells you which model you are holding; 22 being a Stratocaster.
There are some exceptions as you can see in this information provided by Mike Gagliano.
The model numbers change yet again (for example, “09”=Stratocaster). April 1973-1980: Fender dropped the old style date stamp after March 1973 and continued with the new 8-digit code.Also, labeling techniques have changed with Fender owners, slightly adding to the confusion. S.-made Fender guitars and basses from 1950 until today, since they are some of the predominant vintage guitars for sale on Vintageand Typically the serial number is penciled or stamped on the butt end of the heel of the neck of most guitars and basses.1980: Little glued labels with MM-DD-YY date stamps appear in the neck pocket, pickup cavity and/or back of the neck.The neck stamps on Fenders from 1969 to 1971 can be most logically translated by reading from right to left.