French Antique Apollo Belvedere Style Bust Stick Pin in Chalcedony and Gold, Circa 1880

A French antique chalcedony and gold bust stick pin, with a carved bust of a woman's head, after the Apollo Belvedere, in frosted and polished deep brown chalcedony, engraved 532 and Ce on the back, on a gold pin, with an eagle head mark for 18ct gold and an AC maker's mark, circa 1880.