I wore this watch for quite a few years and I can tell you its very durable. The 4.5mm thick sapphire crystal is why this watch can withstand 3500 meters of sea water pressure. Which also makes it very durable to impact. The thick sapphire crystal also produces a blue hue and provides beautiful light refraction at high angles. Both the crystal and bezel are both sapphire and there are no scratches. I recently had this watch serviced so the movent will last many years to come. There is tools in the box that are used to add or subtract links and remove the bracelet. The diver extension has many positions of adjustment for the perfect fit no matter the temperature. The superluminova is green to include the bezel which makes it easy to read at all hours of the night. These watches are hard to find now especially in black and green. See below for specs and model information. Let me know if you have any questions. https://youtu.be/WLqvqwJQtXA?feature=sharedTechnical Details of the Prometheus Poseidon Stainless Steel Black Green Bezel 3500m Miyota 9015 Automatic Diver Watch: 316L Stainless Steel Case with Brushed finish Black Matte Dial with Swiss Made RC Tritec C3 lume applied to indexes Black lumed chapter ring with Swiss Made RC Tritec C3 lume applied to indexes Miyota 9015 Automatic Movement 316L Stainless Bezel unidirectional with 120 clicks with sapphire insert and applied Swiss Made RC Tritec C3 lume Custom made 316L solid stainless steel bracelet with diver extension clasp Case diameter: 43.00 mm without crown Lug to Lug length: 52mm Case height: 15.90mm Lug width: 22 mm Signed screw down crown with Prometheus logo Water resistance: 3500 meters or 350 ATM Helium valve a 9 o'clock Sapphire glass with anti-reflective coating inside watch Watch hands filled with Swiss Made RC Tritec C3 lume (hours, minutes, seconds) Two Years Warranty