The arms, supporters, coronet, and motto are those of John Holles, Duke of Newcastle.
Inscription: .1) A D and C D; No. 6
Marking:  Britannia (English quality mark for sterling);  Lion's head erased (English quality mark for sterling);  Gothic d in pointed shield, date mark for London, 1699-1700;  CH fleur-de-lis above (partial strike) (maker's mark).
Location of mark: On body near lip to right of handle
Artist: James Cox (British, ca. 1723–1800)Date: 1766Medium: Case: gold with diamonds and paste jewels set in silver, pearls; Dial: while enamel; Movement: partly gilded brass and steel, wheel balance and cock of silver set with paste jewelsAccession: 1982.60.137On view in:Gallery 540