Testing label

Testing label - A stamp sized label which is used for testing automatic stamp vending machines.
Tete-beche - French term describing two or more intact stamps which are inverted in relation to each other.

Testing label - Postage stamp identical in most respects with current postage stamps, but either bearing no printed design or one grossly changed to render it invalid for postal use, issued as a coil to test stamp-dispensing machines.

Vignette pour l'expérimentation des machines distributrices de timbres: (Fr.) testing label for automatic vending machines.
Vignette stamps: (Fr.) a non-denominated stamp created to advertise or commemorate a product or event.

See also: Front, Pair, Original gum, On piece, Applied