Physical Dimensions: overall: 16.4 x 11.7 cm (6 7/16 x 4 5/8 in.)
Provenance: Purchased in Madrid in 1849 by William Stirling-Maxwell [1818 - 1878], London (from an album with his device and bookplate as William Stirling). (Bernard M. Rosenthal, Inc., New York); purchased 1960 by Lessing J. Rosenwald; gift to NGA, 1964.