License, verbatimPD
The Rijksmuseum, Amsterdam: image designated Public Domain (Public Domain Mark 1.0) in the museum's own Linked Art record.
Konstantin von Gumoëns (vermeld op object). Joh. Rudolphus Sinner S.R.I.L.B., Consul Reipcae. Bernensis, 1813 - 1864. Rijksmuseum, Amsterdam.