Buffalo N.Y. Jun 1 1901, American machine with "Pan-American Station" flag ties 2¢ Pan-American (295) on maroon expo ad cover to Buffalo N.Y., Jun. 1st arrival backstamp; small part of flap missing, small edge tear, F.-V.F. and scarce, This cancel is mostly found on cards. Bomar Nos. B01-11  Estimate $200 - 300. $0 (Image)