Split planchet possibility cannot be dismissed.
I have seen a New Zealand CuNi 10 Cents split planchet, that broke into three perfectly round components.
With this particular planchet error, the remains of the obverse and the reverse image could be seen, but the surfaces exhibited a very rough appearance of metal distress, quite different from evidence supporting corrosion from acid.
Edited by sel_69l
02/24/2020 5:29 pm