20c Light Ultramarine, Double Impression (515c). With right selvage, original gum, small h.r., showing part of two additional impressions at right, fresh and Fine, very scarce, the P.F. has certified only three singles, a pair with straight edge at top and a block of fifteen containing three examples of the variety, for a total of eight examples, all seem to be from the right vertical row of the pane, this is the first single we have offered since at least 1994, with 2021 P.F. certificate, undercatalogued in Scott

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