Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1
Lot 364:
1973, Jefferson Memorial, 10c blue, bottom left corner sheet margin block of four, imperforated horizontally, control markings on the left selvage, full OG, NH, VF, C.v. $600 as two pairs, Est. $250-$300 , Sc. #1510e
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