The 'Owl' bookends appear for the first and only time in the Gero Catalolgue of 1933. They are rare as procuction was expensive and commerical succes was therefore limited.

cf. Gero Catalogus September 1933, no. 1766, for an illustration of a similar book-end
L.F. Jintes & J.T. Pol-Tyszkiewicz, Chris van der Hoef 1875-1933, Drents Museum, Assen, 1994, p. 116, no. 185, illustrated

See illustration (also p. )