Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1289:
1918, black overprint (type 4) on 5k claret, vertical pair, top stamp has overprint type 4, while bottom one with overprint type 5a, full OG, NH, fine centering, each one expertized by J. Bulat, Est. $150-$200,Bulat#1153-1190
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