This is a hard one to price as you really don't know if the Paladin Press adds anything, and google doesn't show anyone actively looking for that model. In my experience with these older smaller runs is to price them like you would a similar model from the same maker. Sometimes the attribution to a certain person or firm adds a tiny bit, other times nothing.
So, if I was the buyer, I'd ask Terzuola what he'd charge to make one now, and scout a few dealer sites to see how much similar standard Terzuolas are going for on the aftermarket. If I was the seller, I'd look at those two numbers, then list it a decent bit higher for a bit with an "offers considered" cause. That should tell you if the Paladin attribution adds anything significant.