The Montblanc 1858 Geosphere 0 Oxygen Limited Edition has the particularity of being totally oxygen-free, which improves its performance and precision over time, even in the most difficult mountain environments. The total absence of oxygen inside the movement not only prevents tarnishing but also prevents oxidation.
The 42 mm bronze case with a bidirectional ceramic bezel houses a dial with the Maison's "glacier" motif. The watch is powered by the MB 29.25 automatic movement with in-house complication . Both the northern and southern hemispheres are represented with two dimensional globes and include a day/night indication so the wearer knows what time it is anywhere in the world.