Reminiscent of a fighter jet with its square cabin in grade 5 titanium (transition metal popular in aeronautics and aerospace for its hardness, light weight and resistance to rust and high temperatures), the monopusher BR-X1 chronograph tourbillon is powered by a manual wind calibre which provides a power reserve of up to 100 hours. The model designed by Bell & Ross showcases its mechanical heart beneath grey-tinted sapphire crystal. The so-called traditional hours and minutes appear in the centre tracked by two openwork luminescent hands. They glide over applied metallic hour markers and a white decal minute track whose graduations appear on the chapter ring. The chronograph function (seconds and minute counters at 2 and 10 on the dial respectively) is started, stopped and reset using the monopusher at 2 on the case side. Price: 148,000 CHF. Sharmila Bertin