52 mantle
https://www.ebay.com/itm/1952-Topps-...u&LH_Auction=1
Interesting, didn't even know a grading company could return a card with "unknown." Looked up the psa number in the database, but couldn't find a match. Usually I assume 99.9% of ungraded 52 mantles on ebay are fake but im curious about this one. Any experience with this seller "pre1971cards" ?