Proof 1956 Postal Union Conference die proofs on gummed paper (57x70mm.), comprising master in pale blue (two states), 3f. lake-brown, 10f. deep blue, 28f. pale blue and black.
Proof 1956 Postal Union Conference die proofs on gummed paper (57x70mm.), comprising master in pale blue (two states), 3f. lake-brown, 10f. deep blue, 28f. pale blue and black.
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