Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 903:
1977, Postal Official and (Sorting Machine), die proof of (4k) in brown representing a part of engraved design (stage proof), artist G. Komlev, engraver I. Mokrousov, size 118x88mm, produced on wove paper without gum, VF and very rare, Est. $400-$500, Scott #4621
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