Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 3
Lot 1029:
1898, 7k blue, letter-sheet of series 2, printed in St. Petersburg, containing 26 various advertisements inside, locally sent in St. Petersburg on November 4, which is the earliest recorded date of usage, mostly VF and rare, ex- Vadim Ustinovsky, Est. $500-$600
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