1859 18kr Blue without Silk Threads (18, Mi 15) vertical pair, full o.g., good margins all round, rich deep color, full original gum,  extremely fine, a magnificent pair,  $8,400.00 as two singles,  used pairs of this issue are generally valued at a 50% premium. (Mi E8400 as singles)  In the Boker collection there were no unused multiples of the 18kr, and only one single. Truly an exhibition piece.
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