Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 3
Lot 1209:
1981, Centenary of Welding, invented by N. Bernardos, two sunken die proofs of 6k of black color only, one is complete design, the other one has N. 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. $800-$1,000, Sc. # 4934
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