Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1261:
1918, violet overprint (Arnold type 1) on 3k red, three- side margin imperforate block of ten (5×2), full OG, NH or hinged (two stamps), VF, multiples of this type of overprints are very scarce, this block is the largest known positional piece, ex-Dr. Seichter and Dr. Zelonka, Est. $300-$400, Bulat #115
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