In 1969, CBS-Fender began to implement a new type of neck stamp in place of the usual date stamp consisting of model code, month, year, neck width (e.g.8 DEC 65 B for a Duo-Sonic II with a 1 5/8 inch neck width).
An example of this is 02033923 found on a Jazz Bass.
From 1972 through about March 1973, this new system was used concurrently with the old Month-Year date stamp.
Again, a neck was stamped with either the new type of code or the old date stamp, but not both.
CBS-Fender used this neck code system concurrently with the standard Month-Year date stamp that had been in use since 1962.
Both type of stamps can be found on Fenders made from 1969 through 1971.
To clarify, a neck would have one or the other type of stamp… It is not known why Fender used two completely different systems at the same time.
Then in 1972, Fender changed to a new type of neck stamp which had 8-digits which was stamped in green or red ink.
The strange and mysterious neck codes found on Fenders from 1969 – 80 have been all but ignored by the vintage and collectible guitar community.
Perhaps this is due to the fact that 1970s Fenders have, until recently, been all but ignored by the vintage and collectible guitar community.