Worldwide Air Post Stamps and Postal History, One Man Collection of Tannu Tuva, Philatelic Rarities of the World, Part 2
Lot 659:
Description
1934, Argali and Airplane, imperforate trial color proof of 25k in green, right margin triangle, full OG, NH, VF and very rare, Est. $800-$900 , Scott #C5
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