Problem Holsum card on Ebay
 

I was momentarily geeked to see this Eddie Foster Holsum card on Ebay, but alas it is almost certainly a fake. https://www.ebay.com/itm/22505066751...Bk9SR9a9xMGEYw
The back is stamped or horribly printed– you can see ink bleed in some of the letters and light to missing ink print in others. The front also carries a serif typeset/font as would be typical of a 1917 E135 card, when Holsum cards use a non-serif font.
https://i.ebayimg.com/images/g/-1kAA...UG/s-l1600.jpg
https://i.ebayimg.com/images/g/c9EAA...UI/s-l1600.jpg

I was interested because I have not confirmed Foster to be in the Holsum set as a Washington American, where he did not play after 1919. If he were part of the set it would almost certainly be a Type 1 from 1920, yet this card is Type 2, and Foster already has a card in the Type 2 group with Boston.

Proceed with caution. It seems you would have the Ebay guarantee in play given the price of the card, unless Seller accepts a Best Offer below the guarantee amount. Still and this is breaking news– the graders don’t always get it right.

I believe you've got a couple of things wrong in this statement:
1) eBay guarantee still applies since the price started above the limit, even if a best offer is accepted below it.
2) eBay guarantee on a slabbed card is to verify the slab is not cracked, not that the card is real or overgraded, and it will go to PSA for verification and the PSA person reviewing the sale will likely pass it and send it to the buyer.
3) After that, the recourse is to actually use the PSA grade guarantee as the buyer, and get PSA to confirm the card is counterfeit once you own it, then get reimbursed. PSA should not be able to claim mechanical error and get out of it, so this is where I expect the buyer would get their money back, in the case that they actually find out the card is fake.

So because of that, I highly recommend contacting eBay, the seller, or PSA, to have the card returned to PSA to be cracked out before it gets sold.

Thanks for the clarification.
Makes sense.