Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 3
Lot 1372:
1918, violet overprint on 25k green and violet, block of four, bottom right stamp with inverted overprint, full OG, NH, VF and rare multiple, each stamp expertized by J. Bulat, C.v. $500 as four stamps with upright overprint, Bulat #271, var
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