Well, it is a tad high to my mind by $1000-1250. The pickguard tip is both common, and for me a good sign that it is probably legit. Someone would have to have it in hand, and pop some stuff apart to know for sure. But for an L series 65 P that is all there but for a hopefully decent refin, I would imagine these days that would run in the $3k or less ballpark. That seems to be the area that I have been seeing on ebay, although Gbase dealers almost always ask in this range in their dreams, and those basses never move for that price.
I am kind of spooked by the description. Getting a valuation from a pawnbroker is never a sign of market awareness. Getting a figure of $12k and then deciding a great thing to do is to refinish - that is the sign of a freaking idiot. The mention of dials confirms it. Personally I would expect to deal with a bozo, and it is sadly a 50/50 chance that they would stick hard to the price, or take a $1000 and a line of coke.