This extraordinary top, inlaid with a kaleidoscope of specimen hardstones and marbles within an Ashford marble border, was probably manufactured in Derbyshire. The region's output had been greatly promoted by William Spencer Cavendish, 6th Duke of Devonshire (d.1858) who was inspired by the Florentine workshops he visited on his grand tour. For an interesting comparison, see the octagonal table in the Sculpture Gallery at Chatsworth illustrated here in the late 19th century.