Marking:  Leopard's head crowned (London assay office mark);  F (London date letter for 1683–84);  Lion passant (English quality mark for sterling);  B.M., two pellets above, star below in heart-shaped outline (maker's mark).
Location of marks: All marks struck on underside of base.
Notes on marks: The third pellet in the maker's mark is part of a second similar mark otherwise obliterated.
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