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

RSFSR Issues 1918-23

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Start price: $250

Buyer's premium:

1921, 250r pale violet, color variety, complete sheet of 50, contains two panes of 25 with gutter in the middle, full OG, NH, VF and scarce multiple, Est. $400-$500, Scott #183 var