Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 3
Lot 1199:
1977, Postal Official and Postal Code, die proof of (4k) in brown representing a part of engraved design (stage proof), artist G. Komlev, engraver L. Mayorova, size 120x87mm, produced on wove paper without gum, VF and very rare, Est. $300-$400, Sc. # 4619
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