Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 2
Lot 873:
1917, Assassination of Archduke Ferdinand and Archduchess Sophia, 10h, 15h and 40h, four perforated trial color proofs for each denomination, the total is 12 pieces, full OG, NH (5) or LH, VF , Sc. #B13-15
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