Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1024:
1978, sunken die proof plate-form for ”Vifag” printing machine, containing 18 different types of engraving, size 121x100mm, produced on gummed stamp paper with traces of hinging, VF and extremely rare, only a few known, Est. $500-$600
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