Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 3
Lot 1042:
1898, 7k blue, letter-sheet of series 28, printed in Saratov, containing 39 various advertisements inside and on reverse, sent from Moscow to Kronstadt, VF and scarce, ex-Vadim Ustinovsky, Est. $500-$600
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