Zenith, El Primero Chronomaster Bullit, ref. 24.2160.4063, ceramic chronograph watch with opening on the dial revealing the balanceMovement: cal. 4063, automatic, 31 jewels, no. 454960Case: no. 229856, diam. 44 mm, glass back revealing the movementComplications: 2-counter chronograph with centre seconds, date window, subsidiary seconds counterZenith strap: black rubber with steel pin buckle and black Zenith PVDSignature: dial, movement, case