Swiss. A fine and large 18K gold openface minute repeating perpetual calendar chronograph keyless lever watch with phases of the moon

Swiss. A fine and large 18K gold openface minute repeating perpetual calendar chronograph keyless lever watch with phases of the moon
Unsigned, retailed by Calderoni, Milan, case no. 14'455, circa 1910
With nickel-finished highly jewelled keyless lever movement, bimetallic compensation balance, wolf's tooth winding, minute repeating on two polished steel hammers, the white enamel dial with Arabic numerals, outer red 24 hour display, blued steel spade hands, four subsidiary dials indicating month combined with leap year display, day, date and phases of the moon combined with constant seconds and lunar calendar, in circular plain case, repeating slide in the band, chronograph button in the crown, cuvette signed Calderoni Milan
57 mm. diam.