Bell & Ross Watch BR X5 Black Titanium BRX5R-BL-TI/SRB. Equipped with the BR CAL.323 self winding mechanical movement, the BR X5 Black Titanium guarantees COSC certified chronometer performance. It also offers a power reserve of around 70 hours, as well as a rapid date correction function. Bell & Ross has opted for titanium, a prized material in aeronautics due to its robustness and lightness, at only one third of the weight of steel. Hypoallergenic, non corrosive and non magnetic, titanium delivers both practicality and performance.