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runscott1) Is it on card stock or something thinner?
2) Is that the remains of a reddish border around the edges of the card? If so, do the other two have it?
I think both of these questions are important in determining if the card is a proof.
Also, don't put too much stock in what an "expert" says. I took my Cobb to an "expert", prior to the actual purchase, and was told not to buy it. Why? - it "didn't look right". Of course not - unique, never before seen cards don't "look right". Fortunately I had enough confidence in my own ability to distinguish real pre-wwI lithography from fake to make my own decision (although I also had another person who I have great respect for look at it first).
Also, remember the PSA guys are supposed to be experts but they graded the notebook Lajoie as a "proof". That was, in my opinion, one of the stupidest errors they've made.