1c Green, Booklet Pair, Imperforate Between (331a var). Deep rich color, centered to top as are all the few known genuine examples

FINE. A VERY RARE ERROR PAIR. FEWER THAN TEN HAVE BEEN CERTIFIED.

This error was discussed at length by George Brett in the Philatelic Foundation's Opinions V and updated by Roger Brody in Opinions VII.

With 1958 P.F. certificate. Footnoted in Scott under the normal booklet pane listing as "a variety resulting from booklet experiments"

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