What year were PAF's put in Gibson ES-335 until?

PAF's first appeared in the ES-175TD in 1957. They were stock in the 335 from 1958 to 1962. However, you would still sometimes see 335's with a combination of PAF's and patent number sticker pickups as late as 1964. This is because after Gibson started using the patent number stickers they still continued using the old PAF decals until they were all used.

 

This is the best website I'm aware of for this issue:
http://www.provide.net/~cfh/paf.html

A '66 ES-335 may well have the orange-colored wire that is more like a T-top instead of the maroon wire of the PAFs.

In my opinion, you should find a ES-345 made before mid-1967 and yank or bypass the varitone. Gibson made fewer guitars with gold hardware and so the "good" early style Pat # pickups with the maroon wire that are like short-magnet PAFs exist far later in the gold-hardware guitars than for ES-335s. You can get mid-60s ES-345s for less than $4000 all day long, and lemme tell you, they sound damned good--PAF tone in spades. Some of the '67s even have chubby necks; but as you may know, Gibson went to narrower nuts (1 9/16 instead of 1 11/16) sometime in 1965.

Read the posts by J45 in this thread:

http://www.lespaulforum.com/forum/showthread.php?t=117692