Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 3
Lot 1378:
1918, violet overprint on perforated 1r brown, pale brown and orange in block of four, full OG, NH or LH (top stamps), VF and rare multiple, expertized by Dr. Seichter, C.v.$1,400 as hinged singles, Bulat #526
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