Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3
Lot 1118:
1921, the first definitive issue, large die proof of unissued denomination 3½r light brown, printed on thin glazed cardboard, size 103x133mm, no gum as produced, VF and extremely rare, only a handful printed, ex-Gorski, Est. $3,000-$4,000
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