Rare Swiss 18K yellow gold World Time dress watch Circa 1950

Gold open faced lever pocket watch 
–
A fine and rare Swiss, 18K yellow gold keyless World Time dress watch, circa 1950.
A solid, polished case, bi-directional revolving bezel bearing the name of 65 locations worldwide with a fixed inner 24-hour chapter. Silver dial with applied yellow gold baton indexes. Gold dauphine hands. Movement, 17 jewels, straight-line lever escapement, monometallic balance, flat balance spring with micrometre regulator. Dial, case and movement signed.
–
Thickness: 15 mm
–
Diameter: 52 mm
–
Signed: Gübelin  Swiss