Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 2
Lot 931:
1919, 20pf on 10k and 40pf on 20k, complete set of two, each one with straight line ”Dorpat” cancellation on a piece, VF, C.v. $320, Mi #1-2, €400, Est. $100-$150 , Sc. #N1-2
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