While rolling the BU cents from the bag I came across this rainbow toned cent with the two round punches in it. Any ideas what caused these marks?
If it came from a mint bag, could it be mint produced Rockwell Test marks? http://www.error-ref.com/rockwell-test-mark-in-planchet/
I hope they are Rockwell Test marks... and not the results of a bored kid with a BB gun and some free time! Keep us posted!
From the reference I posted, the planchet was tested and then struck. The OP coin also doesn't appear to have the pressure ridges around the 'holes', that would result from the PMD. BUT, now looking at the reverse, it also wouldn't have the bulges since it was struck and the dies would have taken care of that. SO...???
Just wanted to say that there are definitely preasure ridges around the anomalies on the obverse. Look at how the reflected light changes at the edges
And the strike would flatten and pretty much wipe out the test marks, and it would completely wipe out the bulges on the back side of the planchet/coin.