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Hertug Haakon Magnusson PI XXI . en Seal of Duke Haakon Magnusson of Norway later Haakon from document dated February Oslo Text SIGILLVM HAqVINI DEI GRACIA ducis norveGIE Size mm Brinchmann Chr Norske Kongesigiller og andre Fyrstesigiller fra Middelalderen Drawing by Hakon Thorsen before Custom marker PDold PDold