Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3

Imperial Russia - Postal Stationery items

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Start price: $250

Buyer's premium:

1899, letter-sheet of 7k blue, series 1, printed in St. Petersburg, containing over 30 various advertisements inside and on reverse, folded several times, some flap wearing, still VF, Est. $400-$500