Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 3
Lot 1136:
1983, Base Ship, two sunken die proofs of 20k in dark blue with and without hatching of ”20”, both are in gray black, first one with printer’s angles, artist Y. Artsimenev, approximate size 95 -100x120mm, printed on gummed paper with hinge traces, VF and very rare, Est. $1,000- $1,200, Scott #5161
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