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One of the highlights is this portrait of a man, pictured right, believed to be William Pitt the Younger, who became the youngest prime minister of England at the age of 24 in 1783.

The miniature measures 1¾in (4.5cm) high and is by Charles Sherriff (1750-1831), a deaf artist who is notable in part for having attended Braidwood’s Academy for the Deaf and Dumb, the first school of its kind in Britain.

The wealth of the sitter in this portrait is suggested by the elaborate frame, which features gold fausse montre with seed pearl-set bezel and blue enamel border picked out with gold paillons.

Also in the frame are locks of brown hair tied with diamonds within bold beads and further blue glass.

The subject is dressed in a navy blue suit with a white waistcoat and tied cravat and his hair en queue. In good condition, the piece is priced £3500 at Hill’s exhibition.

Complimentary tickets are available from Hill who can be contacted through the details on her website.

ellisonfineart.com