Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 3
Lot 1410:
1918, black overprint (type 36) over 10k/7k light blue and over 20k/14k blue and carmine, part of OG, VF, expertized by J. Bulat, both stamps are priced with ”-” in the Cat., Bulat #1926, 1928
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