Any collectors ever come across or own a 1973 Topps Schmidt proof/promo card? I have the opportunity to purchase the card pictured below but I'm not sure if it's authentic. From what I understand, the proofs are quite rare.
Have not seen it in person, but the seller says it is blank-backed. As you can see the black ink is missing from the front. Any comments as to authenticity/value?
Thanks in advance.
Rob
