1877 - 20c blue Bigola and 10c blue changed colour
1877
1877 - 20c blue Bigola and 10c blue changed colours, 'twin colours' franking from 'BERGAMO BASSA 28 AGO 77' to Riva (Austria). Extremely rare combination, possible for only one month. Superb. E. Diena certificate (Sassone T26+27)
sat 14 November 2026
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