Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 1152:
1961, Helicopter over the Kremlin, black error surcharge without 6k on 60k ultramarine, positions 20 of 80-stamp sheet, full OG, NH, VF and scarce error, which occurs in a small part of print run only, guaranteed genuine, N. Mandrovski certificate, Est. $1,200-$1,500, Scott #C98 var
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