Antique dealers are not dumb, they research stuff all day long while they sit behind their booth, and there is plenty of research available regarding baseball cards online.
Lets take the clearly fake 1915 CJ's, those are sold on Etsy all day long for $2. The giveaway is the bold typeface and the centering. If those were real the ask should be in the $300 range for commons that nice.
So this guy either got duped and is trying to pass on the dupe to an unsuspecting mark, or he's buying off Etsy for $2 and deceiving the public.
Either way, he knows what he is doing.
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