That is the 50 million dollar question. The last breed in the pack is how it used to be known.........so to capture one would IMHO be in the £500 pound mark, but I'll leave it to someone who perhaps has bought one recently. All I can say is, they are as rare as rocking horse poo!
My adage has always been "If you like it, and it shoots well, go for it" the sheer provenance will be the attraction!