Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 2079:
1918, two stamps with violet overprints (type 2d) on Romanov Dynasty 14k and over black surcharge 20k on 14k, favor cancellations, VF and rare, 25 or 50 examples were produced respectively, first one expertized by J. Bulat, C.v. $360, Bulat #379-80
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