Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2

RSFSR Issues 1918-23

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Start price: $150

Buyer's premium:

1921, 250r pale violet, color variety, printed on ordinary paper, complete sheet of 50, contains two panes of 25 with vertical gutter in the middle, full OG, NH, VF, Est. $300-$400, Scott #183 var