Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 1162:
1918, black overprint (type 3b) on 15k brown lilac and blue, two bottom left corner sheet margin blocks of four, lower right stamp if each block has missing part of the design due to foldover, full OG, NH (6) or VLH, VF, Bulat #622, var
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