Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 1183:
1918, black overprint (type 5) on black surcharge 20k on 14k blue and red, minor perf irregularities at top and paper fold, still large part of OG, F/VF and rare, expertized by U.P.V., J. Bulat and others, priced with ”-” in the Catalog, Est. $200-$250, Bulat #1478
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