Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1609:
1917, Archduke Ferdinand and Archduchess Sophia, 10h, 15h and 40h, four perforated trial color proofs for each denomination, full OG, NH (5) or LH, VF, Est. $120-$150, Scott #B13-15
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