Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 1179:
1918, black overprint (type 1) on perforate 70k brown and orange, block of 15 (5×3), left stamps in the middle and bottom rows have missing overprint, full OG, NH, VF, expert’s mark on reverse, ex-Dr. Zelonka, C.v. $150 for hinged single stamps, Bulat #1389, var
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