Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 90:
SPECIALIZED COLLECTION: 1920-23, 36 mint stamps, including complete set of #C4-8, ”key” stamps have the A. Teetsov perforation (expertized by him) with extra red 20m/5m+5m, others – mainly black surcharge 10m on imperforated 5m+5m, representing plate varieties of basic stamps and surcharges, neatly identified on stockpages, full/large part of OG, NH or LH/hinged, mostly VF, C.v. $1,650++, Est. $600-$800, Sc. # C1-6, var
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