An early 20th Century platinum cameo watch ring

An early 20th Century platinum cameo watch ring
The cameo carved with a female profile, millegrain-set, between single-cut diamond accent borders, opening to reveal an oval cream dial with Arabic numerals and blued steel hands to a foliate engraved gallery and single-cut diamond openwork shoulders, mechanical movement, circa 1920, finger size M
Movement and case no. 10667