The clean lines of the Vanguard Colorado Grand Slim chassis conjure a retro motorsport feel with sweeping curves like those designed to cheat the wind on vintage racecars. On the dial, a circular grain section emulates the engine turned dashboards of a bygone era, while the running seconds display calls to mind a retro tachometer style used to track an engines RPM. The motor of choice for the Colorado Grand Slim is the Franck Muller Cal 708-S6. This automatic-winding timekeeping engine has been designed, engineered, fabricated, decorated and installed entirely in-house by Franck Mullers own talented team of watchmakers & technicians and accurately & elegantly tracks time while running at 21,600 beats per hour. Visible via the sapphire rear windshield, this slim movement allows an overall height for this timepiece of only 9.1mm. holding the Colorado Grand Slim comfortably on your wrist is a handsewn calfskin strap featuring a linear tread pattern that would have been right at home on the racetracks and roadways of the past.