TWO IMPERIAL PORPHYRY ROUNDELS
LATE 18TH/EARLY 19TH CENTURY
Together with an Italian white marble oval frame or base with a later inserted Imperial porphyry panel, 19th century
The roundels: 8 1⁄8 in. (20.5 cm.) and 7 ½ in. (19 cm.) diameter
The frame/base: 7¼ in. (18 cm.) high; 6.2⁄8 in. (15.7 cm.) wide; 1 ¾ in. (4 cm.) deep