This is just my best guess...
Genuine = not a fake coin but real.. they will verify that the coin is actually REAL and not counterfeit.
UNC - details = there is some issue with the coin
Altered surface = perhaps the coin has been exposed to some chemical which has caused a reaction on the surface of the coin..
Yeah I know not much help here.. but to me the tag says it all...
The coin itself probably shows no signs of wear, therefore UNC but still something has happened to this coin where it's now a problem.
I'm not a US coin guy so I don't know the rarity of this particular coin .. but a problem coin is tough to sell... that slab is sometimes refered to as a "body bag"...
Genuine = not a fake coin but real.. they will verify that the coin is actually REAL and not counterfeit.
UNC - details = there is some issue with the coin
Altered surface = perhaps the coin has been exposed to some chemical which has caused a reaction on the surface of the coin..
Yeah I know not much help here.. but to me the tag says it all...
The coin itself probably shows no signs of wear, therefore UNC but still something has happened to this coin where it's now a problem.
I'm not a US coin guy so I don't know the rarity of this particular coin .. but a problem coin is tough to sell... that slab is sometimes refered to as a "body bag"...






















