Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1266:
1918, violet overprint (type 2gg) on imperforate 20k blue and carmine, full OG, LH, VF, expertized by Dr. Seichter, priced with ”-” in the Cat., Est. $150-$200, Bulat #537
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