The first watch to feature a unidirectional bezel with a dual scale for depth and dive time to calculate a safe ascent without decompression stops, this DOXA Sub 300 Aquamarine Automatic Men\'s Watch showcases a beautiful blue dial for stand out style on land and underwater. At A Glance Presented on a stainless steel bracelet 42.5mm case size with 300m water resistance Aquamarine dial with unidirectional bezel Black baton hour markers with date window at 3 o\'clock Scratch-resistant sapphire crystal with an anti-reflective treatment Powered by a three-hand self-winding automatic movement with COSC Certified Chronometer Power reserve of up to 38 hours