11c Light Green, Perf 10 at Bottom (511a). Block of four, bottom left stamp perf 10 at bottom, bottom right stamp transitional perfs with Perf 10 at left and Perf 11 at right, "Chicago Ill." precancels, both errors with natural creases as often found on used examples of this rarity

VERY FINE APPEARANCE. A RARE BLOCK OF FOUR CONTAINING ONE STAMP ENTIRELY PERFORATED 10 AT BOTTOM AND ANOTHER WITH TRANSITIONAL PERFORATIONS AT BOTTOM.

With 2010 P.F. certificate

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