Worldwide timekeeping and highly functional chronometry. Travelers across the Atlantic Ocean in the early 20th century would have found this timepiece’s two complications immensely useful: a 24-hour display with day & night indication for a second time zone and an in-house developed TwinFly chronograph. A small world map subdial at 12 o’clock shows the hometime, linked with the blued central hour hand. Also in central position are the red gold-plated hour and minute hands for the local time as well as the chronograph minute and seconds baton hands. A subdial at 6 o’clock shows the small seconds and carries a large date window. The TwinFly chronograph of the new Manufacture Caliber MB LL100.1 is driven by a column wheel. Its start and stop functions are controlled by a vertical disc clutch via a pusher at 2 o’clock; a pusher at 4 o’clock resets it. The lower pusher also activates the eponymous fly-back function, which stops, resets and instantly restarts the elapsed minutes and seconds at a single touch. For better readability, the chronograph indication has two separate scales. The exterior seconds scale bears small Super-LumiNova dots every five seconds, while the interior minutes scale has 10-minute markings in red. Red gold-plated Roman numerals and indexes on the silvery-white dial with an exploding star pattern are the hallmark of the Montblanc 4810 collection. In a 43 mm stainless steel case with straight horns, this timepiece is a sophisticated travel companion.