Mickey Mantle Card Identification

[Semitar6]

Just f.y.i. for anyone interested. Heritage auctions just emailed me and told me this is with 99 percent certainty, a authentic printers proof of the Mantle. This is what they told me. "Your card is probably 100% authentic and I say that only because I’m going off a scan. There was a find some years ago of Stahl-Meyers cards that we assume came from an employee of the print shop as they were all blank backed, never had the heavy wax applied nor the corners diecut. None of the cards had any type on the reverse Other examples have sold in the past and based on that your card would probably sell in the $700-1,000 range. Definitely a card I would like to include in our next Signature Catalog Auction in the Fall."