Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 3
Lot 1499:
1918, black overprint (Special types) on 15k brown lilac and blue on vertically laid paper (rounded top right corner) and 15k red brown and blue, both are postally used, the last one on a piece, fine and scarce, Bulat #846 -47, C.v. $400, Est. $150-$200
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