Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1065:
1924, World Postal Congress, King Gustav V, 5kr blue, block of four, an excellent item in every respect, full OG, NH, VF and scarce multiple, C.v. $2,000++, Facit #210, SEK19,000=US$1,750 as singles, Est. $500-$600, Scott #211
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