Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 682:
Description
1929, postal reply-card (Russian) 5k+5k brown, supposed to be a double card, however initial part and reply part were printed on front and reverse of one card, resulting in reply portion is blank, VF and rare error, Mi #P80, Est. $150-$180
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