Just like the chronograph DC black 66, the chronograph DC 66 Si black features a 12-hour counter, a 30-minute counter and a 60-second counter. The functionality is complemented by a bidirectional rotating bezel. The DC 66Si black significantly differentiates itself from the DC 66 black by its inner workings. The specially developed and patented high-tech DAMASKO components enter in right here. These make the DC66 Si black extremely accurate and durable.