Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 2
Lot 846:
1950, International Philatelic Exhibition, 10+10c-5+5p, complete set of six imperforated trial color proofs, blocks of four, printed on thick wove paper, no gum as issued, NH, VF, Est. $150-$200 , Sc. #B12, CB1‑5
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