Buffalo, N.Y., Oct 11 1901, American machine with involute "1901 Pan-American Exposition" flag cancel ties 1¢ green (279) on multicolor "Alt Nürnberg, Pan-American Exposition 1901" post card to New York City, Very Fine and scarce, ex-Bomar. Bomar Nos. B01-19  Estimate $300 - 400. This machine is a Langford type B-46 involute flag with the year 1901 superimposed on the rectangle of stars. Initially used for a little over three months beginning in September 1899 as a receiving marking at the main Buffalo post office. In October 1901, this canceling device was taken to the Exposition postal station on the fair grounds and installed on the American machine already at the station, the same machine that had previously been used to provide B01-11. $0 (Image)