Pulled this out of one of those US type coin frames with cardboard that must have been sprayed with acid or something... Had to take a picture when dismantling it because those colors blew me away! She'll probably get QC but I like her.
Typical Sulphur look toning, some papers had a lot more quantity of Sulphur in them, early US Mint set (1947 - 1958) cardboard packing can make toning that looks quite similar as well, after that the Mint started using poly film plastic and they weren't so colorful after that.
"Buy the Book Before You Buy the Coin" - Aaron R. Feldman - "And read it" - Me 2013! ANA Life Member #3288 in good standing since 1982, EAC Member #6202, NBS Member, 2˘ variety collector.