Inverts: The term generally used to describe any error where one portion of the design is inverted in relation to the other portion(s). An overprint applied upside down is also an invert.
Rare inverts often have significant monetary worth. Inverted Jennies have long sold for over 100,000USD apiece, and the St. Lawrence Seaway inverts of Canada approach those numbers.
The Pan-Am Inverts
The Pan-American Exposition stamps were issued in conjunction with the The Pan-Am Expo in Buffalo, NY, in 1901. The Expo had been planned for 1900, to celebrate the new century, but delays made the promoters put it off a year.
Pan-Am inverts: U.S. postage stamps issued for the 1901 Pan-American Exposition, on sale from May 1 through Oct. 31, 1901; the 1¢, 2¢ and 4¢ stamps were printed with inverted centers.
In some cases this involves separate press runs (which is how inverts sometimes occur). Generally, multicolored printing is accomplished with different color stations on a single press.
Inverted imprints, or "inverts," most often occur when a handstamp is unknowingly picked up wrong-way-to by a postal clerk, ...
*Invert - a stamp or item of postal stationery on which one portion of the design is upside down in relation to the rest of the design. Inverts can only be produced when the production process requires at least two independent passes through a ...
Souvenir Sheet with 1¢, 2¢ and 4¢ Pan-American Inverts and 80¢ (4) Buffalo (reproductions of the 1901 Pan-Am. Expo invert errors)
03/29/01 ...
Variety -- A variation from the standard form of a stamp. Varieties include watermarks, inverts, imperforates, missing colors, wrong colors and major color shifts. See also Freak.
Variety - A variation from the standard form of a stamp, such as inverts, watermarks, missing colors, imperforates, wrong colors and major color shifts.
The image attached to this record shows inverts from that single sheet, which were reunited during an exhibit at the National Postal Museum in the summer of 1996.
 See also: Invert, Catalog, Stamp, Error, Printing
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