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Bulgarian stamp issued to honor 20th anniversary of FIR
1971, 11 April (date of issue)
Private collection of Krzysztof Slowinski
Federation Internationale des Resistants = Intl. Federation of Resistance Fighters. A set of 2 stamps having the same design but different colors. Denomination 13 St. The design is based on a John Heartfield's photomontage of 1933 "Leipzig Trial".
Catalog number: Scott 1933 (of 1932 - 1933)