Qianlong Imitating archaic bronze mirrors, the zitan disc embellished in mother-of-pearl with four characters reading Qian qiu bao jian, 'The Eternally Treasured Mirror', in seal script, reserved with roundels on a ground densely carved with stylised dragons in low relief, all surrounding a small raised knop decorated with mother-of-pearl, the knop pierced to suspend a tassel, the reverse mounted with a mirror, the finely-grained wood of a deep chestnut-brown tone, box. 21.3cm (8 3/8in) diam. (2).