...; ? sale, François van Harencarspel Eckhardt (1784-1842, Assen) et al. [section ‘heirs of Van Loon’, possibly Willem van Loon (1707-83), Amsterdam], Amsterdam (J. de Vries et al.), 15 August 1842 sqq., Album B, no. 13 (‘Een liggende leeuw, met de pen, door Rembrandt’), with no. 12, fl. 10, or no. 14 (‘Een dito [liggende Leeuw], met bruine inkt, door denzelven [Rembrandt]’), fl. 3, to his son, Jonkheer Pieter van Loon (1801-73);{Copy RKD.} his wife, Theodora Johanna van Loon-Calkoen (1803-79), Utrecht;{Note RMA.} ...; collection William Pitcairn Knowles (1820-94), Rotterdam and Wiesbaden (L. 2643); his sale, Amsterdam (F. Muller & Co.), 25 (26) June 1895 sqq., no. 530 (‘Etude d’un lion, couhé et tourné vers a droit. [...] Hauteur 12, largeur 21 cent.’), fl. 510, to Hendrik Jacobus Valk (1863-1940), Amsterdam, for the Vereniging Rembrandt;{Copy RKD; note RMA.} from whom, fl. 586.50, to the museum (L. 2228), 1901
Bibliography and list of abbreviations for the provenance (pdf)