1c Green, Perf 10, Horizontal Pair, Imperforate Between (543a). Lightly hinged, radiant color, choice centering with wide and balanced margins, long and full perforations all around

EXTREMELY FINE. A RARE AND DESIRABLE EXAMPLE OF THE ONE-CENT PERF 10 ROTARY ISSUE IMPERFORATE-BETWEEN VARIETY, SCOTT 543a.

This is one of the rarest of the imperforate-between errors. We have offered only four other pairs since keeping computerized records (two are in a block).

Ex Whitman and "Sirron" as part of a block containing another error pair. With 2011 P.F. certificate (XF-Superb 95 XQ; the XQ is the Philatelic Foundation's indication of Extraordinary Quality).

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