Worth something to someone. eBay could be good way to get some interest and the price up there. Probably too rare to guess a fair price.
Someone gave me a unique Porter Cable saw a few years back. I estimated that it was worth $80 to someone, and left it on there for several months. Someone contacted me from Connecticut who collected them, and agreed to pay another $20 to ship.
So, if you got the time . . .
Philbert