1861 - 1c blackish grey with ‘2’ instead of ‘1’ numeral error, block of four, the lower-right example showing a well-separated double numeral, mint with gum. The stamp with the double numeral has a slight flaw resulting from the pressure of printing the numerals; the others are perfect. Bottacchi and Manzoni certificates (19l/variety)
sat 14 November 2026
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