A 19th Century sextant by Troughton London, the ivory handle mounted with an oval presentation plaque inscribed 'Presented by the British Government to Captain Gadsden of the American steamer 'Arago' in testimony of his humanity to the crew of the Brigantine 'George' of St Johns Newfoundland in January 1866', N3076 mounted with coloured filters and lenses, 28cm arc