Reinterpreting Minerva watches from the '20s/'30s, the Montblanc 1858 embraces nature. The Montblanc 1858 Geosphere is dedicated to the holy grail of mountaineering adventures - world’s Seven Summit mountaineering challenge. Crafted in a 42mm titanium case with blue and contrasting icy white details referrencing the colours of glaciers. Featuring a manufacture world-time complication developed by Montblanc watchmakers in Villeret: two domed globes turning in opposite directions, that complete a full rotation in 24 hours. Both are surrounded by a scale with the 24 time zones with a day and night indication in contrasting colours. This provides an instinctive way of appreciating the different time zones, aided by SuperLumiNova applied to the continents for increased visibility and performance at night. The timepiece is completed with a blue Sfumato calf leather strap with white stitching.