History of Aviation, Rare Stamps and Postal History of the World, Part 1
Lot 198:
1981, Architecture, 18c x4 black and red, top left corner sheet margin se-tenant block of four with ”7” at left selvage, upper stamps (#1928-29) with missing red color due to strong perforation shift, full OG, NH, VF and extremely rare, Scott listed #1929a and 1930a with missing red (priced with -‘-) and not listed #1928a, probably by mistake, Est. $1,800-$2,500, Sc. #1931a var
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