$1.30-$2.60 Graf Zeppelin (C14-C15). First tied by "Lancaster Pa. May 31, 1930" circular datestamp on cacheted flight cover, used on the return flight to Seville, Spain (these covers did not receive the red circular South America Flight cachet), Seville June 5, 1930 backstamp, Very Fine, it is interesting to note that of the 31,000 pieces of U.S. mail for the return flight, only 814 were directed to Spain, second tied by New York duplex on cacheted flight cover to Alfred Martin in Detroit, backflap tear, otherwise Very Fine

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