Swiss two colour gold dress watch wandering hours Circa 1925

Dress watch with wandering hours and sector minutes
–
A very fine and rare two-colour 18 Carat gold keyless dress watch with wandering hours and sector minutes. Made by Grün, Genève Switzerland, circa 1925. Three-body, polished and brushed case with a yellow gold band, concave white gold bezel and bow and white gold back.
Brushed silver dial with curved aperture for the wandering hours, 60-minute track on the edge, large offset centre seconds and blued steel seconds hand. Rhodium-plated movement with Geneva striping decoration, stamped twice with the seal of Geneva quality mark, 17 jewels, straight-line lever escapement, cut bimetallic compensation balance adjusted to temperatures, blued steel Breguet balance spring and an index regulator.
Dial and movement signed.
–
Diameter: 45.5 mm
–
Signed: Gruen, Geneva