Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 1066:
PROOFS IN MULTIPLES: 1935-37, Airplane, Crocodile, Snake, over 150 mainly triangle stamps of trial issues, including 11 blocks of 4, 8, 16 or 24, each stamp with puncture, some blocks with official notes on margins, occasional faults possible, still full OG, mainly NH, F/VF, Est. $250-$300, Sc. # 165/72, 177/88
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