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.
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.