Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 3
Lot 1126:
1982, Pavel L. Schilling, Inventor of Electric Telegraph, two sunken die stage proofs (engraved part of the design) of 6k in black, differ by light and bold inscription (Pochta USSR and 6k), artist A. Kalashnikov, size120x100mm, printer’s markings at sides, produced on stamp gummed paper, traces of hinges, VF and extremely rare couple, Est. $800-$1,000, Scott #5069
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