I've seen coins with the dark line from contact with a rubber band, I'd bet it layer on something textured that was rubber for a few years, maybe a drawer liner?
"Buy the Book Before You Buy the Coin" - Aaron R. Feldman - "And read it" - Me 2013! ANA Life Member #3288 in good standing since 1981, ANS, Early American Coppers Member (EAC), Colonial Coin Collectors Club member (C4), Conder Token Collector Club member (CTCC), Civil War Token Society (CWTS) member, Liberty Seated Collectors Club (LSCC) & Numismatic Bibliomania Society member (NBS), USMex, Member in good standing, 2¢ variety collector.
TreasHunt is right. I was given a handful of Mercs in a folder and the reverses on all 6-10 had striping on the back. Same with some older IHC I had been given. Such a shame.
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