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RobertSI own a few of these that I purchased in the 1980s for a song. The paper is glossy -- definitely not newspaper stock, but not cardboard or postboard either.
Many that I've seen have fold marks but are otherwise in phenomenal shape and are almost definitely originals. The thing I've always found interesting is I've never seen them with corners ripped or torn off -- they've survived pretty well given how fragile they are.
Lastly -- prices have always been cheap (in the early 1980s you could buy them for as low as $10-$20 even from dealers who knew what they were.
Robert S.