It is a classic EDC watch reedition of first DS 1 which is the first Certina watch with DS system. To prove it's possibilities it was used durring the swis aplinist expedition to the Mount Dhaulagiri. For a half century, DS on Certina watches is a sign that provides increased resistance to shock and moisture. This model is powered with ETA 2834-2 which has date and week day complication. The accuracy is about +/-15s per day, but in practice it can has accuracy in interval -1/+5s as real CSOC watch.