Here is another post Scott (SMtJoy) started:
http://www.net54baseball.com/showthread.php?t=117276
He is one of the most knowledgeable Exhibit collectors I've run into. In summary, in this post he indicates here is a list of the Exhibits that were reprinted:
OK here is the list of reprinted exhibits-
Dark Grey-
Aaron
Berra (Yogi version)
Campanella
Ford (pitching version)
Fox
Hodges (B on Cap)
Mantle (No White outline version)
Mays (Batting)
Musial (Kneeling)
Newcombe (Dodgers on Jacket)
Reese (ball visable version)
Snider (B on Cap)
Spahn (B on Cap)
Williams (#9 not showing)
White cardstock, all of the above plus-
1956 Dodgers
1956 Yankees
In my experience, you really need a scan of the back to detect reprints. If the auctions don't have scans of the backs (or won't send them), I pass on the auctions. When I have compared reprints to an original looking at the front only, I could tell the differences based on print resolution. However, it was very difficult and don't think I could have done it if I did not have it in my hand.
M Wheat