1859 50 Gr., dark violet-brown lake (lacca bruno scuro violaceo), bottom left corner sheet marginal block of four. The lower left stamp shows an almost complete double print. Fresh mint multiple with original brownish gum.
A spectacular and highly important exhibition multiple, combining the desirable sheet margin with a striking near-complete double-print variety. An exceptional rarity of outstanding visual appeal.
Expertise: Signed "ED" Emilio Diena, "AD" Alberto Diena, Cert. Giacomo Bottacchi, AIEP (2026).
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