Conditions where it was stored mostly. Could be from sulfur in paper in a coin folder, could be air polutants, could be temp changes from hot to cold creating slight condensation on the coin from humidity. A lot of environmental factors at play as to why toning happens, and rainbow. This looks natural to me, although rapid considering the date of it.
Some collector might want that toning and pay for it. Many people want clean clear coins without it.
It's preference really. I don't think the condition of the coin itself warrants much premium above face value but give it another 50-100 years and see where the toning is at and what examples are left for collectors above whatever grade that coin is. Ya never know.
You could probably get $2 -$5 for it on the bay now though from somebody, it's just not something a coin shop would buy from you if you tried to sell it there.
Some collector might want that toning and pay for it. Many people want clean clear coins without it.
It's preference really. I don't think the condition of the coin itself warrants much premium above face value but give it another 50-100 years and see where the toning is at and what examples are left for collectors above whatever grade that coin is. Ya never know.
You could probably get $2 -$5 for it on the bay now though from somebody, it's just not something a coin shop would buy from you if you tried to sell it there.






















