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

Imperial Russia

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Start price: $100

Buyer's premium:

1912 (30.6), 10k in light blue color shade from the printing of 1909, used on pre-printed cover from Baku to Tehran via Isfahan, all appropriate transit markings and arrival ”16.VII.12” ds, VF, Est. $150-$200 , Sc. #79a