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

Estonia

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Start price: $300

Buyer's premium:

1919-20, Viking Ship, imperforated proof of 5m black and yellow orange (similar to colors of issued stamp), central design is inverted, no gum as produced, NH, VF and scarce, guaranteed genuine, Mi #13x KF, €1,500, Est. $500-$600 , Sc. #35