Oris Watch Prodive Date. No holds barred Based on its bigger brother, the Oris ProDiver Chronograph, this watch is safe, sturdy and solid. The titanium case, ceramic top ring, crown protection, innovative Oris Rotation Safety System (RSS), and automatic helium valve are standard ProDiver features. At 49mm in diameter, it may be smaller than the chronograph, but it's just as impressive. No restrictions, no rules, just pure Oris.