Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 272:
1975, Flag over Independence Hall, 13c dark blue, red and brown red, transition block of 20 (2×10), representing blind horizontal (all through the block) and vertical perforation at left and between 6 rows, that is forming 6 horizontal pairs imperforated between stamps, 2 pairs imperforated between stamps and on the right and 2 pairs imperforated vertically, slight foxing on the right stamps, full original vertically ridged gum, NH, VF and very rare, C.v. $240 for 6 pairs imperf between, pairs imperf vertically have priced with ”-”, Est. $700-$800, Sc. # 1622a, e
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