Seen through the glass at Baselworld 2009, this is the TAG Heuer Monaco 24 Concept chronograph, produced as an homage to the 24 Hours of Le Mans race. Inspired by the Le Mans endurance racecars this prototype comes with a caliber 36 movement that “floats” inside a square-shaped 40.5mm black PVD-coated Monaco case, suspended within a steel-tube housing, the mechanical components can be viewed from the front and back of the watch.