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Reinerus Frisius Gemma by Maarten van Heemskerck. Gemma Frisius by Maarten van Heemskerck oil on panel cm Institution Museum Boijmans Van Beuningen accession number OK object history by Jacob PleydellBouverie nd Earl of Radnor Longford Castle Bodenham Salisbury br by Agnew's art dealer London br ProvenanceEvent acquisition