Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 3
Lot 1502:
1918, violet overprint (type 1) on 3k red, top left corner margin pane of 25, stamps on positions 22-23 with additional black overprint, Khorol postal cancellation, ex-Dr. Zelonka, Bulat #944/983, VF and rare in postally used condition, Est. $300-$400
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