Certina Watch Powermatic DS PH200M C036.407.18.040.00. Certina watches has always enjoyed getting to the bottom of things not just in terms of precision and durability, but also where ocean research is concerned. In its latest creation, the Swiss watch brand is reviving a historical model that is just as current today as it ever was. The DS PH200M represents a seamless continuation of its predecessors timeless design, combining it with a high performance automatic movement of the latest generation.