Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1
Lot 149:
1961, Helicopter over the Kremlin, black surcharge 6k on 60k ultramarine, horizontal pair, right stamp without ”6” variety of surcharge (positions 19-20 of 80-stamp sheet), full OG, left stamp has somewhat gum foxing in places, right one (error) is completely all right, NH, VF and scarce error, which occurs in a small part of print run only, N. Mandrovski certificate, Est. $1,200-$1,500, Sc. #C98, var
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