Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1274:
1918, black overprint (type 2) over black surcharge 10k on 7k light blue, nice and fresh, full OG, LH, VF, expertized by Dr. Seichter and others, priced with ”-” for unused stamp and $250 for used, Est. $150-$200, Bulat #137
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