Oris is one of a small handful of Swiss watch brands that makes only mechanical watches. A mechanical watch is a thing of beauty, designed according to principles that have been around for generations and will continue long into the future. Oris is constantly striving to make better watches that offer beautiful, innovative functions and advanced performance levels. For example, the in-house developed Calibre 400 Series of Swiss Made automatics promises a five-day power reserve, anti-magnetism, and a 10-year warranty and 10-year recommended service intervals.