Tête Bêche Pairs
Tête Bêche Pairs of Definitive Issues from 1968
Tête Bêche stamps are pairs of stamps in which one stamp is positioned upside down relative to the other stamp.
Grossman, Samuel. Stamp Collector's Handbook. New York: Longacre Publishing, 1970.
"Switzerland." Standard Postage Stamp Catalogue. 1997.
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