Cal. 2385 nickel-finished lever movement 37 jewels the black engine-turned dial with applied diamond-set numerals luminous hands three subsidiary dials indicating 12 hours and 30 minutes registers constant seconds eccentric window for date in large rectangular case with curved diamond-set sides the back secured by four screws two oval chronograph buttons in the band 18K white gold Audemars Piguet deployant clasp forming the letters AP case dial and movement signed