Inverted Jenny

The Inverted Jenny is a famous error of a 1918 24¢ US airmail stamp with the vignette of a Curtiss JN "Jenny" biplane upside-down. Only one pane of 100 was ever found, with the usual range of centering and also normal straightedged stamps. Over the years, several have been damaged, and several straightedge examples have been reperfed. One stamp was used. If you have to ask, you can't afford one.

In 2013, self-adhesive versions were issued in souvenir sheets of 6. Direct orders could potentially "win" one of 100 souvenir sheets with a normal upright airplane. It was found that not all were actually made available this way and undistributed ones were put in normal stamp stocks. Meanwhile, the inspector general noted that intentional creation of errors was illegal. Of course, no one was punished.  File:US inverted jenny.jpg|1918 Inverted Jenny. File:US 2 dollar inv jenny.jpg|2013 version. 