Was looking on Fleabay for some Mexican coins, and just happened to see this one. It is really amusing, as I would consider it to be solidly AT, and it seems as if it will end up being sold for some money: http://www.ebay.com/itm/1948-Toned-...9e46ce7&pid=100005&rk=5&rkt=6&sd=252756250817
I don't know much about artificially toned and naturally toned (I am not a collector of such). What I did notice is most all of his offerings are rainbow like toned coins.
That are almost all raw and a lot have an identical look. There is a reason they aren't in slabs when the toned market is bringing big premiums