Swiss white gold Art-deco tonneau-shaped brooch watch Circa 1925

White gold, diamond and onyx-set lapel watch
–
An elegant Swiss 18K white gold, diamond and onyx-set tonneau-shaped Art-Deco keyless lapel watch, circa 1925. With a matching bow brooch set with 66 round diamonds and large inset onyx sections, suspended by a two-link chain set with 59 round diamonds and two onyx sections. Accompanied by a fitted box. Hinged case back with engraved border decoration, bezel set with 54 round diamonds surrounded by an onyx outer case. Matte silver dial with Arabic numerals, outer minute track and blued steel epee hands. An oval, rhodium-plated movement, Geneva striping decoration, 18 jewels, straight-line lever escapement, cut bimetallic compensation balance, blued steel flat balance spring, index regulator. Unsigned, movement signed Genève.
–
Dimensions: 30 x 20 mm
–
Thickness: 6 mm
–
Signed: Anonymous  Geneva