Proof 1980 World Telecommunications Day, with white background working die proofs 75f. (7), 135f. (7) and miniature sheet (7, three cut close), and with blue background working die proofs 75f. (5), 135f. (5) and miniature sheet (5), all on gummed paper; also spectacular artwork involving handpainted designs (2, one for each value), both with overlay and instructions
Proof 1980 World Telecommunications Day, with white background working die proofs 75f. (7), 135f. (7) and miniature sheet (7, three cut close), and with blue background working die proofs 75f. (5), 135f. (5) and miniature sheet (5), all on gummed paper; also spectacular artwork involving handpainted designs (2, one for each value), both with overlay and instructions
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
