License, verbatimPD
The Rijksmuseum, Amsterdam: image designated Public Domain (Public Domain Mark 1.0) in the museum's own Linked Art record.
Carl Mayer (mentioned on object). Portret van Ferdinand II von Sachsen-Coburg-Gotha, gemaal van koningin Maria II van Portugal, 1829 - ca. 1840. Rijksmuseum, Amsterdam.