Here's a reverse negative lefty 82 Fleer John Littlefield #576 - blankback proof version! This is a card that could have prevented things had Fleer editors caught the mistake on the proofing sheet.

The hand-cut card was graded Authentic by SGC - there is small crease above his cap, and bigger area in the bottom left where the trees are which you might be able to see if you enlarge the pic.

Please ask any questions, and check out my other rare Fleer proof variations (including a Littlefield).  Thanks!