8 DEC 65 B for a Duo-Sonic II with a 1 5/8 inch neck width).
The new code consisted of 6, 7 or 8 digits and was usually stamped in green ink.
Both type of stamps can be found on Fenders made from 1969 through 1971.
A few Telecasters have shown up with neck codes that would indicate a 1967 date and one has been reported with a possible 1968 date, yet the rest of the guitar appears to be from 1969.
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.
Andre Duchossoir briefly discussed his findings for the 1972-80 codes in his excellent Telecaster and Stratocaster books. I used this information as the starting point for my research.
For Telecasters, Telecaster Thinlines, and Esquires that code is 3.
For Stratocasters it is 22 and for Precision Basses it is 5.
The next one or two digits denote the month, in this case 11 = November.