Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1041:
1981, Centenary of Welding, invented by Nikolai Bernardos, two sunken die stage proofs of 6k of black color only, one is complete engraved design, the other one has Bernardos’ portrait only, first one with printer’s markings and manuscript ”Correct letter ”B” (on proof it is oblique at top left), sizes 115-120x100mm, printed on gummed paper with traces of hinging, VF and probably unique couple, Est. $1,000-$1,200, Scott #4934
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