Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 3
Lot 1509:
1918, inverted black overprint (type 7) over black surcharge 20k on 14k blue and carmine, large part of OG, VF, expertized by Dr. Seichter, Bulat #1265 var, this invert is not listed in the Catalog, Est. $150-$200
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