Rectangular portrait-format miniature in watercolour on ivory in an elaborately patterned gilt metal surround, set in a black-lacquered backing board, with a gilt metal fitting in the form of grapes or similar fruit at the top for a (missing) suspension ring. There is also a later wall fitting visible on the right side. A gold-painted inscription below the image reads 'ADMIRAL VISCOUNT KEPPEL. / 1725 - 1786'. The sitter is shown bust length against a sky background, facing forward but with his head slightly turned to his left. He wears the captain's full-dress of 1748-67, with the left lapel falling inward over his waistcoat and the corner of his hat showing, tucked under his left arm.

This item is a copy of part of Reynolds's full-length portrait of 1760, engraved in mezzotint that year by Edward Fisher, but of which the plate greatly suffered from reworking for at least two subsequent printings. It is itself only of mediocre quality (possibly amateur work?) and probably from one of the later - and poorer - issues of the print (such as PAF4364) rather than Fisher's original one (PAF3462). It has also bleached badly from light exposure. The frame is 19th-century and could be the original one.

The Museum has four oil portraits of Keppel from the many painted of him by Reynolds, his friend of forty years, after Keppel helped the young artist fulfil his ambition to visit Italy by giving him passage to Minorca in the 'Centurion'. They include the great full-length of 1753 that made Reynolds's name on his return home, and which he never sold (BHC2823). This miniature was one of two acquired in 1964 which were previously in possession of Admiral Colin Keppel (1862-1947). A signed note by him on the reverse shows he bought it in July 1936 from Loewenthal, a dealer in St James's Street, Piccadilly, so it was not a longstanding family piece.