yes Ted, cards can be re-fronted. I have seen a card one of my collecting friends did for fun. It had an Art Fromme front and an Obak reverse. I have seen T206 cards carefully seperated front from back also, so it can be done. Glue formulations that can't be detected by graders are easy to come up with. sophisticated adhesives didn't hit the market until around WWII, so most "glues" were simple hide glues or plant based glues.
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