1c Green & Black, Pan-American, Center Inverted (294a). Block of four, original gum, rich colors, small hinge-reinforced perf separations, few insignificant toned perf tips at bottom right not mentioned on accompanying certificate

FINE AND RARE BLOCK OF FOUR OF THE ONE-CENT PAN-AMERICAN INVERT.

The Pan-American inverts were the first bicolored postage stamps produced by the Bureau of Engraving and Printing and the first invert postage errors issued by the Post Office since the 1869 Issue. The 1c Pan-American Inverts were found in several post offices around the country. Thirteen blocks of four, a block of six and the block of 20 offered in our 2018 sale of the William H. Gross collection are recorded in our Levi records. Some of the multiples may have been broken into singles by now.

Ex Whitman and Middendorf. With 2001 P.F. certificate.

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