Zenith Chronomaster El Primero a stainless steel triple calendar chronograph bracelet watch with moon Phases circa 2000. Dial: silvered, applied Roman and triangular numerals, three engine turned subsidiary dials for constant seconds, 30-minute and 12-hour registers, apertures for day, date, month and moon-phases. Calibre: cal. 410 Z automatic 31 jewels. Movement number: 13606. Case: circular case with triple stepped rounded bezel, stepped lugs, glazed display back secured by six screws. Closure: Zenith brushed and polished track link bracelet and double folding clasp dimensions: 40 mm diameter, bracelet circumference approximately 175 mm. Signed: case, dial and movement. Accessories: Zenith presentation box