Identification / Validation of Vintage 1964 Fender Princeton AA964

Hello - I'm considering a very clean, locally advertised Fender Princeton (non-reverb) AA964. Being sold as "1964", but there's a "PJ" stamp on the tube chart I cannot reconcile. Any help would be greatly appreciated.

Sadly, I don't appear to be smart enough to figure out how to insert an image into this post.

The "PJ" ink stamp on the tube chart indicates a date of manufacture of September in 1966. Unless the original cabinet was switched there's no other explanation save for the seller's ignorance. A bonafide '64 specimen with have no logo (nor the provision to mount one) on the baffle board, front and rear panels marked "Fender Electric Instrument Co.", and a tube-chart stamp prefaced with an "N". Additional confirmation can be gleaned by examining the EIA codes of the transformers, the control pots, the cap can, and the speaker (if both the latter are original).