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Originally Posted by steve B

Seems plausible to me.

In the late 70's there was a "craft" that involved making transparencies from printed matter. A bit of scotch tape or better yet packing tape, a bowl of water and a bit of rubbing to remove the paper and the transparency was done and ready to frame as a suncatcher. I did a couple 79 Topps commons and it was pretty easy.

Substitute some better plastic film, and an adhesive that can be easily removed from the ink after it's been readhered to a new card and it's pretty likely the process.

Prepping the card to provide a new back looks a bit tougher. The scraped surface would be obvious because it's not smooth. But I'm betting some simple chemicals would do the trick, leaving the smooth white cardboard surface.

Steve B

That's extremely scary.