I guess my question is, given the low quality of these cards when made, is it simply too easy for a counterfeiter to pass one off as real? In person, testing for fakes might be somewhat doable, but I would't know how to do it online.
Here are a couple of examples - can anyone tell with reasonable confidence whether they're real?
https://www.ebay.com/itm/1921-W551-B...gAAOSwlJ1atsrG
https://www.ebay.com/itm/1921-W551-B...sAAOSwYeNbG5Ie
By including these examples, I don't mean to imply in any way that the sellers are doing anything wrong -- the cards may be 100% legitimate, but it may also be that the sellers don't have the expertise to know for sure whether the cads are real.
Thanks for any feedback!