Eberhard. An early 18K gold hinged single-button chronograph wristwatch with enamel dial

Eberhard. An early 18K gold hinged single-button chronograph wristwatch with enamel dial
Signed Eberhard & Co., Chaux de Fonds, circa 1920
With nickel-finished jewelled lever movement, the white enamel dial with red and black Breguet numerals, outer red tachometer scale, blued steel Breguet hands, two small subsidiary dials indicating constant seconds and 30 minute register, the circular case with decorative moveable wire lugs, hinged back, one lozenge-shaped chronograph button in the band, case, dial and movement signed
40 mm. diam.