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AnonymousHi Brian. I believe that your card is 1/4 of a 1929-30 four-on-one Exhibit postcard. See http://www.oldcardboard.com/w/exhibits/1929-30/1929-30.asp?cardsetID=796 for an example from that set. The line on one end of the back of the card is the divider line on the postcard back. Gray was part of that set. --Lyman