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Stockholmia 2019 'Patron' postcard. The postcard depicts the venue of the exhibition, the Waterfront Congress Centre. Official postcard #3 (3). Edition 1 000. Concept Bengt Bengtsson FRPSL. AD Maria Gadh. 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.