Something definitely seems off about this listing. The seller is selling such a high grade card but only includes one picture, one that is publically available on PSA's website,
http://www.psacard.com/photograde/. If I were bidding, I would definitely request additional pictures and a little provenance to verify that the seller actually owns the card pictured.
On a separate note, does anyone else know why the label on this card is so different from that of all of the other PSA 1952 Topps Mantle cards? It looks to be a real card and real case given that it is the actual card listed on the PSA website, but the label looks very strange to me and would otherwise cause me to question its authenticity.