1877 - 20c blue Bigola and 10c blue 'inverted colors' franking with 'twin values' from 'BERGAMO BASSA 28 AGO 77' to Riva (Austria). Extremely rare combination, possible only for one month. Splendid. Cert. E.Diena (Sassone T26+27 - Zanaria-Serra Lire 18,000,000)
sat 16 May 2026
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