1956 FIPEX - 5th International Philatelic Exhibition Show Seal - New York, New York - April 28 - May 6, 1956.  Printed by the American Bank Note Company.  Dark blue variety.  This example is OG, and has a hinge-reinforced crease - more visible on the back photo.  Great collateral for U.S. #1075, the Souvenir Sheet that was issued by the B.E.P. in conjunction with the Show.

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