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Stockholmia 2019 '150th Anniversary RPSL' display board. The board has yellow background and blue lettering. The Stockholmia 2019 Internationell Frimärksutställning (International Stamp Exhibition) was held from 29 May to 2 June 2019 at Sweden, Stockholm. The exhibition commemorated the International Celebration of the 150th Anniversary of the Royal Philatelic Society London.