The Montblanc 1858 Geosphere Chronograph 0 Oxygen The 8000 Limited Edition of 290 pieces pays tribute to the world’s highest peaks and the alpinists who dare to climb them. It is housed in a 44mm titanium case totally devoid of oxygen and is powered by Montblanc’s Manufacture automatic chronograph worldtime movement, Calibre MB 29.27. This chronograph includes a date at 3 o’clock and two 3D turning counters with the Northern Hemisphere at 12 o’clock and the Southern Hemisphere at six o’clock. Both hemispheres feature 12 orange dots, marking the 8000m peaks, and day/night indicators. It comes fitted with a fluted bi-directional black ceramic bezel with cardinal points and a 3D coloured laser engraving on the caseback.