Following his recording breaking ascent to Everest with the first Montblanc 1858 0 Oxygen timepiece in May 2022 without supplemental oxygen, Mark Maker Nimsdai Purja continues to serve a the inspiration for the latest edition of the watch that’s ready to accompany him on his next adventure – the Montblanc 1858 Geosphere Chronograph 0 Oxygen The 8000 Limited Edition 290.