Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 3
Lot 1079:
1919, black overprint (plate 1, position 69)”Poczta. Polska” on Austrian 3h violet, full OG, LH, VF, expertized by S. Mikstein and others, C.v. $500, Est. $250-$300, Sc. # 41
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