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.
Struck on a split planchet, especially one that is paper thin, it most likely wouldn't have everything readable. Not enough material to strike up details.
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