Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 2

Estonia

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Start price: $200

Buyer's premium:

1936, St. Brigitta Convent, 5s-25s, complete set of four, sheets of 100, intact margins, folded once along horizontal perforation, occasional mostly marginal separations, full OG, NH, VF, C.v. $1,200++, Est. $300-$400 , Sc. #134-37