Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 177:
1975, 13-Star Flag over the 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, plus blind vertical perforation between 2nd and 3rd, 4th and 5th and 6th and 7th stamps, that is forming 6 horizontal pairs imperforate between stamps, 2 strips of four imperforate vertically, slight foxing on the right stamps, full original horizontally ridged gum, NH, VF and rare multiple, C.v. $240 for six pairs imperf between, pairs imperf vertically (4) have priced with “-“, Est. $400-$500, Scott #1622a, e
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