Swiss 18 carat gold open faced pocket watch Circa 1920

Gold watch with an engraved monogram
–
An elegant and thin 18K yellow gold keyless dress watch, circa 1920. The back cover with an engraved monogram CB and a hinged gold cuvette. White enamel dial with black Breguet numerals, outer minute track, subsidiary seconds and gold spade hands.
A rhodium-plated movement, Geneva striping decoration, 17 jewels, straight-line lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring with overcoil, swan-neck micrometre regulator. Dial, case, cuvette and movement signed.
–
Diameter: 50 mm
–
Signed: Ulysse Nardin  Locle & Genève
–
Some decoration of hairlines on the dial.