Customizable dials, faster processing and a new sensor are the heart of a handmade titanium case The name Montblanc conjures images of heirloom-quality writing implements, wristwatches for world explorers and international bon vivants, as well as leather goods born from historic craftsmanship. As such, some consumers might be surprised to learn that the heritage brand—which owns its own mechanical watch movement manufacture—also produces smartwatches. To understand why, …