It may be some fancy-smancy wheel, but it isn't one that was mass produced. Offer them $50 and work up to $75 for a working wheel. You'll have to spend more $$ for bobbins and to put hooks in it. Does that orifice go all the way through the other side of the leather?? If not, it's useless.
It may be worth $100 for a conversation piece, but for a working wheel, it's not worth more than $50-$75.