1960: Inter-American Conference: the selection of Proofs on thick card by Enschedé, Netherlands with frame only Proofs in black, deep blue and violet (3), vignette only in red, green and blue, unaccepted designs (8) in un-issued colours, a further 7 Proofs with Palacio de Gobierno, Quito vignette in differing colours and a full set of 9 in the accepted design. A superb group and extremely scarce (30 items).
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