Montblanc 1858 Geosphere 0 Oxygen The 8000

Technical specifications


  • Hours
  • Minutes
  • Seconds
  • Date
  • Day & Night Indicator
  • Second Time Zone


  • Self Winding/Automatic
  • Manufactured
  • Swiss Made


  • Round
  • Titanium
  • Brushed & Polished
  • 12.80mm
  • 42.00mm


  • Sapphire

Water resistance

  • 10.00atm / 100.00m / 330.00ft


  • Deployment Buckle
  • Titanium


  • Titanium


  • 2023

Official description

The Montblanc 1858 Geosphere 0 Oxygen The 8000 is inspired by Montblanc’s Mark Maker Reinhold Messer, who was the first mountaineer to climb all 14 of the planet’s highest peaks, and is considered among the greatest alpinists and explorers of our time. The timepiece is powered by the MB 29.25 automatic movement with Manufacture worldtime complication, which includes turning Northern and Southern Hemisphere globes, a 24-hour scale, Day&Night indications, dual time display, and a date.

The timepiece comes in a 42mm titanium case with a fluted bi-directional black ceramic bezel with the cardinal points and is fitted with a Sfumato dark grey glacier pattern dial with orange accents, and an interchangeable titanium bracelet with a taper and fine adjustment system.

The caseback for this model features the K2, the world’s second-highest mountain that was chosen by Reinhold Messner himself. The K2 is widely considered the most difficult, technical, and dangerous summit to climb due to the unpredictable weather which can whip up winds in an excess of 200 km/h.

The route climbs at a sharp angle of around 60o and is extremely exposed to the elements. There is no easy way to the top and it is often referred to as the “savage” or “merciless” mountain. Messner first reached the summit in 1979 and the weather was so perfect at the top that he could see for over 200km. He stayed there for a moment, enjoying the beauty of the landscape, and it is for this reason he chose it for this timepiece. This mountain takes its honorary place on the caseback thanks to a 3D laser engraving that provides special colour shading, depth, and realism.