An alliance of useful complications, the chronograph measures 1/10ths of a second. Through a dial opening at 11 o’clock, El Primero Calibre 4063 reveals the visually stunning vision of its beating heart. This model owns a new ceramized aluminium case. The ceramization improves the aluminium resistance to 18'000 vickers. This model integrates a black rubber stap and a genuine carbon fiber dial.