Congrats on the small fortune you've got there. Your grandfather knows how to pick 'em and how to hold 'em. His collection looks like the kind of thing auction houses dream of so if your family doesn't want to hold on to them, I'd advise you consult some classic motor auctioneers before letting "American Pickers" anywhere near them. Those guys need to cover their costs too so typically pay half or less of what they're worth.