To be clear. You want a USA Foundation. The earlier eighties have the P knobs like mine. They are rare. I've been told that the body on mine is an '86, but that may not be accurate because Peavy supposedly switched to black speed knobs sometime in '86.
Mine was built for Doyle with the older body and the newer thin neck. Peavy was trying to get him to move from 7ender. He didn't really recall how much he used it as he was playing mostly fivers by the time he got it.
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If the one you see for $200 has the P knobs, get it. Here's a reverb listing for a set of four that listed for $130. I have seen sellers asking even more than that for them.
https://reverb.com/item/59752029-peavey-p-t-series-knobs-set-of-4-t-60-t-40-t-15-t-25
If you have any pics, send them to me.