Oris Aquis Calibre 400 Automatic 43.5mm Men's Watch 400 7790 4157MBMeet the new Aquis Date Calibre 400 43. 50 mm, a watch we designed to go with you everywhere you go. A watch for every moment and every occasion. This is the joy of mechanics. The luxury of common sense. Oris Calibre 400 makes this Aquis an everyday joy. Our innovative automatic has a five day power reserve, its anti magnetic, it has 10 year recommended service intervals, and when you register it to MyOris, well extend the warranty to 10 years.