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The Montblanc 1858 line draws inspiration from the legendary Minerva professional watches of the 1920s and 1930s, designed for military use and exploration. Reinterpreting these historic models, Montblanc 1858 expresses the spirit of alpine hiking, embodying the modern trend of returning to nature. The Montblanc 1858 Geosphere is dedicated to the “Seven Summits” world mountaineering challenge, the “Holy Grail” of mountain hiking. It features a 42mm fine steel case combined with contrasting black and beige details. The timepiece is equipped with an in-house universal time complication developed by Montblanc watchmakers in Villeret: two domed globes that rotate in opposite directions, accomplishing a complete evolution in 24 hours. Both are surrounded by a scale with the 24 time zones, along with a day/night display with contrasting colors that allows for better appreciation of the various time zones, thanks to luminescent continents, which ensures greater visibility and better performance in the dark. The timepiece is complemented by a vintage technical bracelet in fine steel.
Movement typeAutomaticwinding
CaliberMB29.25
Number of rubies26 Jewels
Balance springFlat balance spring
ComplicationsUniversal timewith rotating Northern and Southern hemispheres globes, 24-hour scale and day/night indication; Dual Time function; date disk
Case materialSterling silver925
DialBlack dialwith luminescent beige numerals
BezelBidirectional rotating bezel
Anti-scratch crystalYes
Crystal shapeBombed
Crystal descriptionDomed sapphire crystal with double anti-reflective coating
Type crystalZapphire
CrownNon-screwed crown, 1 O-ring, fine steel
Water resistance10bar (100 m) bar
Case back materialStainless steel case
Case diameter42 mm
Bezel MaterialSteel– Ceramic