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A very neat toned Sac AT or real?

I was looking thru my collection and found this one today, do you know how it happened?

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coin to high sulfur content in the paper of the wraper.
Brian
Russ, NCNE
I have a whitman for Ikes and SBA's there were a few extra holes so i put in a sac rev. up because the rev. looks alot better than the obv. IMO it didn't want to stay in the hole so i got some tape taped it in put it away for about 2 years pulled it out today and presto very interestingly toned sac. The obv. is mostly red with just a hint of blue and the rev. looks exactly like it does in the pic. I figured i'd ask to see if anyone could figure out what happened.
P.S. would this be considered AT?