After 1873 [1870s], allegedly donated to the City of San Francisco “by one of the Nob Hill-Comstock Lode millionaires” and located in the Courthouse ; after April, 1906-1974, private collection (San Francisco, CA); 1974, acquired by antique dealer (Salt Lake, UT); 1974, sold to Anthony B. Christensen (Bountiful, UT) ; by November 1975, Dr. Warren E. Gilson (Middleton, WI) ; 24 November 1975, deposited on long-term loan to Elvehjem Art Center; 1976, gifted to Elvehjem Art Center [now called Chazen Museum of Art].  in letter from Anthony B. Christensen to Dr. Eric McCready, Director of the Elvehjem Art Center: "To my knowledge this piece was donated to the City of San Francisco by one of the Nob Hill-Comstock Lode millionaires in the 1870s. It was placed in the San Francisco City Courthouse and removed from the courthouse after the "Great Earthquake" and placed in a private estate where it remained until last year ." This information needs to be researched and confirmed.  Anthony B. Christensen is the owner of Anthony’s Antiques and Fine Art, Salt Lake City, UT (founded ca. 1990, https://anthonysfineart.com/pages/contact-1).  Dr. Warren E. Gilson (1917-2000), UW alumnus and founder of Gilson, Inc., a Wisconsin firm specializing in medical instruments https://news.wisc.edu/amid-changing-market-for-scientific-instruments-gilson-continues-to-lead-2/; Gilson was a collector of decorative arts and donor of over 200 objects to the Milwaukee Art Museum between 1978 and 1998: https://blog.mam.org/2017/05/09/questions-of-provenance-stories-behind-the-names-part-1/#more-14464; Gilson donated 16 objects (paintings, sculpture, antiquities, Asian ceramics, and decorative arts) to the Elvehjem Museum of Art between 1975 and 1994.