Hi! Newbie here! need help to identify if this is some sort error on this nickel? Never seen one like it before. At first I thought maybe the nickel coating rubbed off and the copper underneath became exposed, but actually looks more like a copper/nickel mixture? weighed out to 5 grams, so I think that's the normal weight? I tried to research and found very little information. I saw a picture of another nickel that had "improper annealing
?" does this have any value? Any help or info would be greatly appreciated.