Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1
Lot 550:
1991, Harriet Quimby, 50c multi, left sheet margin block of four, imperforated horizontally, perfect condition, full OG, NH, VF and scarce, C.v. $1,800 as two pairs, Est. $700-$800 , Sc. #C128a
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