Rare French slim gold Art Deco style lapel watch Circa 1910

Gold Art Deco lapel watch by Cartier
–
A French very fine, slim Art Deco lapel watch with matching brooch, circa 1910.
Round shaped, 18 Carat yellow gold, enamel, diamond and ruby set case. Case back guilloché, engine turned with the cypher F F O; case band ruby set. Snap on case back with a matching 18 Carat yellow gold, enamel, diamond set on platinum and pearl set brooch. Enamel dial with Arabic radial hours, outer minutes track and Breguet hands. Keyless winding, gilded brass movement with going barrel, straight line lever escapement, compensated balance, and blued steel flat hairspring.
Dial and movement signed
–
Diameter: 29 mm
–
Signed: Cartier