Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 641:
1949, 75th Anniversary of the UPU, nine perforated and imperforated souvenir sheets of four, including seven items with various ”RIS” overprints, one imperforated sheet has ”RIS Merdeka” inverted overprint, full OG, NH, VF, Scott #65b, c var
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