Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3
Lot 1496:
1949, 75th Anniversary of the UPU, 300L ultra and 1000L green, top sheet or top left corner sheet margin blocks of four, full OG, NH, VF, C.v. $720++, Sassone #PA18-19, €950, Est. $250-$300 , Sc. #C18-19
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