Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 990:
1935, Moscow Subway, 5k-20k, complete set of four, nice set in every respect, full OG, NH (5k and 15k) or very small spots of gum skip (counted as hinged), VF, C.v. $760, Scott #551-54
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