I am just thinking out loud, but I think you have to add 50% for resale in the USA. Seriously, possibly 75% for larger items. I am thinking of the guys who buy antiques in europe, for resale in the USA, as you would add 50-75% to items that just can't be found in america.
So, although there might be assorted ones in europe, the comparassion might be, how many have folks seen in the USA? I am thinking of the comparative rareness of things like Finn, Porteguese (sp), Persian Lugers, etc in the past, and as more came into the USA, their value dropped.
If someone found 5 or 10 of them and sold them in the USA, I would expect the cost would go down, or possibly up as more folks could get excited about them
Ed