by Robert Ball Hughes, 1829
This small wax sculpture is only about 11.4cm (4 1/2") high. The National Portrait Gallery lists 2 busts of John Marshall. The other wax bust of John Marshall, 1829, by Robert Ball Hughes is about 17.8cm x 15.2cm x 10.1cm (7" x 6" x 4") and is owned by the Supreme Court since 1961.
From Wikipedia: John Marshall (September 24, 1755 – July 6, 1835) was the fourth Chief Justice of the United States (1801–1835) whose court opinions helped lay the basis for American constitutional law and made the Supreme Court of the United States a coequal branch of government along with the legislative and executive branches.
According to Eliza Ball Hughes in the Sketch of the Life of Robert Ball Hughes, p. 6, while in Washington, Ball Hughes carved busts of President Jackson, Chief Justice Marshall, and others, which he completed in June 1829.
The National Portrait Gallery also lists a wax relief wax relief sculpture of John Marshall, c. 1820-1856, by Alfred S. Waugh and also attributed to Robert Ball Hughes. The sculpture is 29.5 x 19 x 1cm (11 5/8 x 7 1/2 x 3/8") and is owned by the Philadelphia Museum of Art since 1943.
Alfred S. Waugh (c 1810-1856) was employed by Ball Hughes as his assistant for the Renovation of Canova's Statue of Washington starting in 1832.
According to American Portrait Miniatures in the Manney Collection, by Dale T. Johnson, Metropolitan Museum of Art, 1990, p. 228, Alfred S. Waugh was an itinerant sculptor, portrait and miniature painter, profile maker, writer, and lecturer. He was a native of Ireland and studied sculpture in Dublin in 1827 and toured of the Continent before coming to the United States.