Dating a fender p bass
The next digit denotes the year, in this case 9 = 1969.The next one or two digits denote the month, in this case 11 = November.
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.
After March 1973, Fender dropped the old style date stamp and continued to use the new style, 8-digit code until sometime in 1980 when small adhesive labels bearing Month-Day-Year date stamps appeared in the neck pocket, pickup cavity and/or back of the neck.
Now that these instruments are hitting the "magical" 25-year mark, they have suddenly gained attention.
I won’t get into the pros and cons of 1970s Fenders here, but instead, I hope to shed some new light on those weirdo neck codes.