of or relating to a pair of stamps that have been printed with one stamp inverted.
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British Dictionary definitions for tête-bêche
philately (of an unseparated pair of stamps) printed so that one is inverted in relation to the other
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012