Pan American Sta. Buffalo N.Y. Aug 13 1901, Columbia machine cancel with solid star within double diamond inscribed "Pan American Exposition 1901" ties 1¢ Pan-American (294) on F.A. Busch expo post card to Liebersthal Kan., reverse with various Exposition 'stamps' in five colors, Very Fine. Bomar Nos. B01-10  Estimate $2,000 - 3,000. ONE OF THE FINEST OF ONLY 9 KNOWN PAN AMERICAN COLUMBIA MACHINE CANCELS. This machine appears to have worked poorly based on the incompleteness of the known examples. $0 (Image)