French 18k yellow gold keyless dress pocket watch Circa 1912

Gold, platinum and enamel dress watch 
–
A very fine, thin and elegant French, 18K yellow gold, platinum, enamel and rose-cut diamond-set keyless dress watch, circa 1912. Gold, platinum, diamond and pearl-set chain, gold and enamel propelling pencil with seal and the original Cartier fitted box.
–
The bezel decorated with two concentric white enamel lines, platinum body, the band set with rose-cut diamonds, the back decorated with white enamel stripes and a central applied rose-cut diamond-set letter M on aqua coloured translucent enamel ground with laurel leaf border, chain composed of oblong white enamel links intersected by platinum collet-set diamonds and single pearls, propelling pencil with a seal at the top, sleeve decorated with white enamel stripes to match the watch. Matte silvered dial, engine-turned, radial Roman numerals, outer minute track. Blued steel feuille hands. A frosted gilt movement, 18 jewels, straight-line lever escapement, cut bimetallic compensation balance, blued steel flat balance spring, index regulator. Dial and movement signed.
–
Diameter: 45 mm
–
Signed: Cartier  Paris