Folder with color trials Mali 1976 "Operation Viking"(Michel nrs. 565-566) both in sheetlet of 10 and in Epreuve collective on large sheet, Benin nr. 49 in imperf. sheet of 25, Niger UIT (Mich. Nr. 512) in imperf sheet of 25 and Mali 117-119 in imperf. sheets of 20.
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