I can only surmise as to Lange's reasoning behind the 31's creation...... But, unlike Rolex, Lange does aim at the collector/WIS market &, as we all know, we WISs tend to be quite fond of unique technology. And with the popularity of pocket watch-sized wrist watches (many of IWC's popular wrist watches actually contain a pocket watch movement), I think Lange felt (correctly) that if Panerai, IWC, Breitling, et al, can sell so many big watches that have no technological requirement for their over-sized cases, then Lange could probably find a number of high end buyers who would be interested in a similarly oversized watch that does. And, with designs such as the Lange 1, I think most would agree that Lange has never been 1 to shy away from thinking outside the box.