What kind of toning...

Here's a Morgan dollar with a strange toning pattern on the reverse. That side of the coin is mostly shades of gold, but has sky blue toning in the shape of a cross. The obverse is blue and purple with a gold rim. What would cause the cross pattern on the reverse?


Bill


Bill
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Kind of neat and interesting ,now matter how it was made.
I would call that coin the "Sacred Dollar", and I would keep it for a sign
of good luck and good fortune.
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