tête-bêche

[tet-besh] /tɛtˈbɛʃ/
adjective, Philately.
1.
of or relating to a pair of stamps that have been printed with one stamp inverted.
Origin
1880-85; < French, equivalent to tête head + bêche, reduced from béchevet placed with the head of one against the foot of the other
British Dictionary definitions for tête-bêche

tête-bêche

/tɛtˈbɛʃ/
adjective
1.
(philately) (of an unseparated pair of stamps) printed so that one is inverted in relation to the other
Word Origin
C19: from French, from tête head + bêche, from obsolete béchevet double-headed (originally of a bed)