The form of this overmantel shares several design characteristics with drawings and mirrors by the cabinet-maker John Linnell of Berkeley Square, London. The basket form cresting issuing a spray of flowers relates to a mirror supplied for Mrs. Child's dressing-room at Osterley Park, Middlesex, circa 1760-65, whilst the urn dividing the upper plate appears on a drawing for a chimney and overmantle, each illustrated in H. Haywood and P. Kirkham, William and John Linnell, 1980, vol. II, p. 63 and 64, figs. 128 and 129 respectively. Interestingly the upper cartouche in the mirror at Osterley Park contains a portrait, possibly originally apparent on the current lot as the taste of the period was to surmount a chimneypiece with 'a chimney-piece glass and picture'. A mirror with similar palm-carving and surmounted with an urn, possibly originally also being fitted with a picture, was sold, The Property of a Nobleman, Christie's, London, 8 July 1999, lot 67.
The appearance of bevelled glass to one or two of the plates on this mirror would suggest that the glass has been reused from an earlier mirror. Due to the high cost of mirror plate in the eighteenth century it was quite common for older-styled mirrors to be refashioned in more modern frames re-using the original glass.