The reverse of this miniature portrait is engraved "Jane Elizabeth Viscountess Andover - Andrew Plimer". Thus although the attribution has not been confirmed, this portrait may be by Andrew Plimer.
Research indicates that Charles Nevison Howard, Lord Andover was born 13 May 1775 and died from an accidental discharge of his fowling piece on 11 January 1800. He had married Jane Elizabeth Coke on 21 June 1796.
However, it is possible that the case has been reused, as the style of dress appears to date after 1800. 869