A gold-mounted pietra dura portrait snuff box, probably Austrian or German, circa 1770 and later

A gold-mounted pietra dura portrait snuff box, probably Austrian or German, circa 1770 and later

circular, composed of smart segments of different hardstones between white chalcedony stripes, coloured gold openwork thumbpiece, elaborately chased red gold mount, the lid later applied with an enamel portrait miniature in the manner of Jean Petitot, 19th century, of a nobleman with dark hair wearing the costume of circa 1680, within a carved bloodstone laurel frame, apparently unmarked apart from later French control marks

7.4cm., 2 7/8 in. diameter