Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1905:
1943, Tehran Conference, 3r indigo, red and blue, top right corner sheet margin transition block of 12 (2×6), representing six normal stamps at bottom and six at top with shift of blue color in various degree, which is about 2mm from normal on top block of four, full OG, NH, VF and a spectacular piece, Est. $400-$500, Scott #908, var
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