Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1246:
1935, Bactrian Camels, ten perforated (12½-13½) trial color proofs of 3t in various colors, affixed over large greenish gray card with text at the bottom reads: ”ПРОЕКТ. 28 сентября 1933г.”, size 312x278mm, card is fresh and proofs are in exceptional condition, VF and extremely rare, Est. $8,000-$10,000, Scott #69
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