Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 989:
1917, 2k green, side margin imperforate block of ten (5×2), black typo ”OBRAZETS” overprint, in addition the similar block of ten with inverted overprint; the first one is guaranteed genuine, the other one has typo overprint, but with slightly different pattern of the letters, which we never seen before, both with full OG, mainly NH, VF and rare, both mounted on page from a Collection, Est. $300-$400 for first block only, Scott #120
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