Authentic Hublot Big Bang Unico model 421.CI.1170.RX. Features a black ceramic round case measuring 44mm in diameter equipped with a deployment clasp. The skeleton dial is set against the silver-toned luminous hands and features Arabic numerals/index hour markers, minute markers around the outer rim, along with two sub-dials displaying small seconds and minutes/seconds functions on separate dials located at specific positions; date display appears at 3 o'clock while the chronograph sub-dials show hours and minutes. Automatic-chronograph movement powered by Hublot Calibre HUB1280 provides a 72-hour power reserve. Comes with black rubber strap.