The mirror frame is veneered with an unusual timber called cocus wood, a hard, dense wood with a chocolate brown heart and a yellow sapwood, often referred to, erroneously, as laburnum. It was imported from the West Indies and was often known as West Indian ebony. It was used as a cabinet wood between 1660-1740 and in the present instance, a section of cocus wood has been end-cut to provide a decorative 'oyster'-veneer (A. Bowett, 'Myths of English Furniture History: Laburnum Wood Furniture', Antique Collecting, June 1998, pp. 22-23).
A George I cocus wood card-table was sold from the Humphrey Whitbread Collection, in these Rooms, 5 April 2001, lot 365 (£11,750).