Reportedly Trivulzio collection, Milan; (Count Alessandro Contini-Bonacossi, Florence); purchased by 1937 or 1939 by Samuel H. Kress, New York, as Sienese, c. 1500; gift 27 February 1950 to the Samuel H. Kress Foundation, New York; gift 1961 to NGA.
- Distelberger, Rudolf, Alison Luchs, Philippe Verdier, and Timonthy H. Wilson. Western Decorative Arts, Part I: Medieval, Renaissance, and Historicizing Styles including Metalwork, Enamels, and Ceramics. The Collections of the National Gallery of Art Systematic Catalogue. Washington, D.C., 1993: 45-48, repro. 46.
The ornaments are attached to a pieced strip of worn, dark red velvet with a satin backing, of uncertain date. Eight are enameled in blue. The bottom lobe of 1961.9.194 is damaged, the enamel of the figure's chest lost.
X-ray fluorescence analysis of the metal disks indicated they are made of mercury-gilded (fire-gilded) silver. An area where enamel is lost, the central portion of disk 1969.1.194, shows only silver. The light and dark blue enameled areas contain silver (perhaps from the base) and small amounts of copper, zinc, and lead. The green areas contain the same elements, with a greater concentration of copper, which is probably responsible for the coloration in both the blue and green areas.
 Report, 19 March 1987, in NGA conservation laboratory files.