Sinn Watch U50 SDR Silicone Black. 1050.040 Silicone Black. This Sinn U50 SDR watch completely redefines the notion of a professional diver’s piece with a 41mm case engineered entirely from German Submarine steel. This material is known for being extremely resistant to sea water and processes the highest levels of non-magnetic properties, keeping the automatic movement within protected. Appealing to all kinds of discerning ocean explorers, the case of the Sinn U50 SDR fitted with a captive diver’s bezel which has been treated with a black hard coating using Sinn’s famous TEGIMENT technology. This innovation ensures that the surface has a significantly greater level of protection against scratches. Ensuring easy readability when under the water, this Sinn U50 SDR watch is equipped with a highly legible matte black dial decorated with indices and hands coated in a luminescent colour. The seconds hand is also adorned in vivid red which stands out effortlessly against the rest of the design, making important time related decisions all the easier when under the waves. The hour, minute, seconds and date function are powered the SW300-1 automatic movement which is kept protected behind a screw down case back. The case back along with the screwable crown and scratch resistant sapphire crystal glass help ensure this Sinn U50 SDR watch is provided with an impressive water resistance of 500 metres, a rating in accordance with the European diving device standards. To complete the look of this Sinn U50 SDR watch, a sporty black silicone strap and classic stainless steel buckle is added.