Possibly the stamp of John Carteret 2nd Earl Granville (1st creation) (1690-1763), or Granville Leveson-Gower, Viscount Granville, subsequently 1st Earl Granville (2nd creation) (1773-1846) A further possibility is John Carteret’s second wife, Sophia Fermor whom he married in 1744, but this is unlikely as she was countess for only one year before her death during childbirth in 1745. The child was also named Sophia (1745-1771) who became Countess Shelburne on her marriage to William Petty, 2nd Earl of Shelburne in 1765.