Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 923:
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 strong inscription (Pochta USSR and 6k), artist A. Kalashnikov, size 120x100mm, printer’s markings at sides, produced on stamp gummed paper, traces of hinges, VF and extremely rare couple, Est. $1,000-$1,200, Scott #569
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