Hi everybody! Friend of my just received his coins back from NGC and one of the coins came back as Mint error, Reverse Struck Thru. There is snake-shaped formation above date. https://www.ngccoin.com/certlookup/3929030-012/ My friend doesn't know much about Australian coins, neither do I, but maybe somebody does. So, are Australian struck through errors common? Does it command any premium, or is it "just gold"?
