Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1850:
1966, Wilhelm Pieck, two die proofs of 6k in indigo or dark violet, artist S. Pomansky, engraver A. Tkachenko, sizes 30-31×41-43mm, perfect quality, no gum as produced, VF and rare, Est. $1,000-$1,200, Scott #3197
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