![unused Block of Four 10c. orange-vermilion mint block of four [49-50/57-58] with practically full original gum. Very fine and scarce. Signed E. Diena and G. Oliva. S. 17, L.8,250,000. Photo](https://www.christies.com/img/LotImages/1999/SKS/1999_SKS_01212_0220_000(115314).jpg?w=1)
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unused Block of Four 10c. orange-vermilion mint block of four [49-50/57-58] with practically full original gum. Very fine and scarce. Signed E. Diena and G. Oliva. S. 17, L.8,250,000. Photo