There is no mistaking a reprint from an original proof. Look at the plates these are printed from and you will see to use these plates, they need to be polished and re-engraved, a costly exercise. I do not think the ABN made any money or recovered their costs on the reprints they made in the 1980's. I also understand the ABN used inks they made themselves that are not available elsewhere so again originals are hard to reproduce.