Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 2106:
1918, black overprint (type 6) on 3.50r black and gray, printed on vertically laid paper, block of six (3×2), clear Odessa ds, VF and scarce multiple, ex-Dr. Zelonka, C.v. $450++, Bulat #1222
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