HAFNIA'76 International Stamp Show - International Society of Postmasters, Series 1976, Silver proof medallion, Franklin Mint. HAFNIA '76, Denmark's first international stamp exhibition was held in Copenhagen, Aug 20-29, 1976. Among the aims of HAFNIA is to create national as well as international respect for Danish philately by making the exhibition a worthy setting for collectors from all over the world to view and examine Danish stamps.