As part of the Pan-American Exposition held in Buffalo in 1901 the United States Post Office Department issued a series of six commemorative stamps. Each stamp featured an ornate colored frame enclosing a black-and-white image of some means of modern rapid transportation. In the standard American Scott catalog, these six stamps carry the numbers 294-299. The first day of issue for the stamps was May 1, 1901.
Inverted one cent denomination
The Inverted Jenny is a 24 cent United States postage stamp first issued on May 10, 1918, in which the image of the Curtiss JN-4 airplane in the center of the design is printed upside-down; it is one of the most famous errors in American philately. Only one pane of 100 of the invert stamps was ever found, making this error one of the most prized in philately.
Inverted Jenny
Inverted Jenny, 1918 issue, block of four, with center-line arrow at left
Benjamin K. Miller, whose Inverted Jenny stamp was stolen in 1977
The Inverted Jenny plate block of four (note that the blue plate number is inverted as well). As of June 2015, it was owned by shoe designer and collector Stuart Weitzman.