A gold model of a kettledrum commemorating the victory of the racehorse 'Kettledrum' in the 1861 Derby, the 'drumskin' made with a grey hardstone and

A gold model of a kettledrum commemorating the victory of the racehorse 'Kettledrum' in the 1861 Derby, the 'drumskin' made with a grey hardstone and being a seal stamp with the following hand written inscription reverse engraved KETTLEDRUM, WINNER OF THE DERBY, 1861, attached to a gold chain nearly 12in. in length