Built on the sturdy Avenger platform, the A1733010.C756.147A Seawolf is also a functional success: despite the technical constraints imposed by the need to withstand pressures of 300 bars, its dimensions have been kept very reasonable and offer perfect ergonomics. Breitling also commissioned researchers at the Federal Institute of Technology in Lausanne to perform numerical simulations in order to ensure perfect geometry for the case. The components that are critical in terms of water resistance feature dramatically outsized specifications: the A1733010-C756-147A watch crystal is 4.80 mm thick and the caseback 4.75 mm thick. The screw-locked crown is a patented design. The Avenger A1733010/C756/147A Seawolf also features a safety valve enabling it to balance the differences in pressure inside and outside the case. As soon as internal overpressure reaches approximately 3 bars, the valve automatically evacuates the helium built up during prolonged stays at great depths and thus avoids the case exploding.BrandBreitlingCollectionAvenger SeawolfGender/SizeMensModel #A1733010.C756.147AMovement Type:Swiss Automatic Certified (self winding)Dial:BlueCalendar:DateCrystal:Sapphire Scratch Resistant & Anti-ReflectiveCase Material:Stainless SteelBezel Material:Unidirectional rotatingCase Diameter:44 mm (1.73 in)Case Back:Screwed DownCrown:Screwed DownBracelet Material:Stainless SteelBracelet Finish:Brushed and High PolishedBracelet Length:8 in (20.3 cm)Bracelet Sizable:YesClasp Type:Fold Over Clasp with Push ButtonWater Resistance:300 meter (985 feet)