Back in the 20s, Minerva watches were assembled for military use and exploration; these timepieces inspire Montblanc's 1858 range – with the 1858 Geosphere Limited Edition being the latest in the coveted line-up. An ode to the world’s Seven Summit mountaineering challenge, this bronze and leather automatic watch features a scale with 24 time zones, a day and night indicator, and luminescent continents for optimum performance at night.| Montblanc bronze and leather automatic watch100% bronze; strap 100% leatherStyle number: 128504Pin-buckle fasteningRound dial, luminescent rose gold-coated Arabic numerals and indexes on dial, bi-directional turning bezel, domed scratch-resistant sapphire-crystal glass with double anti-reflective coating, fluted bronze crown with Montblanc emblem in relief, microbille-poli bezel finish, world time with turning northern and southern hemisphere globes, 24-hour scale and day/night indication, dual time indication, date by disc, 26 jewels, MB 29.25 calibre, flat hairspring balanceCase diameter: 42mmWipe with a clean, dry clothWater resistance: 10 bar / 10 atm / 100m / 330ftMade in SwitzerlandTwo-year manufacturer's warranty