Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 2010:
1923, Philately for the Labor, bronze, gold and silver surcharges on RSFSR definitive stamps, complete set of six, including 2r+2r on ordinary and on thin paper, full OG, NH (bronze on 1r+1r and three others) or LH (silver surcharge), VF, the ”key” stamp ex-K. Vassilyev, all are guaranteed genuine, C.v. $1,900, Scott #B38-42
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