Montblanc 1858 Geoshpere 0 Oxygen Mount Vison Automatic 43.5mm Watch Limited Edition of 986 Pcs. Halo Theres a 42mm black dial HBAHOFCLS8R Z65 Theres a 42mm black dial and the watch has a maximum 3 day power reserve and combines the latest in hairspring technology with an escapement developed through the MEMS technology to achieve high accuracy and stability when worn the birthplace of Spring Drive Montblanc’s 1858 Geosphere 0 Oxygen collection continues to explore the planet’s wildest landscapes with a series dedicated to alpinist and Montblanc Mark Maker Reinhold Messner and his achievement of climbing the seven highest mountain peaks on each of the seven continents Completing the timepiece is a blue green interchangeable rubber strap featuring a taper and a fine adjustment system