The Certina DS-1 Big Date Powermatic 80, reference number C029.426.11.041.00, is a men's automatic watch featuring a 41mm stainless steel case and a blue sunray dial. It is powered by the Powermatic 80.651 movement, offering an 80-hour power reserve and enhanced with a Nivachron balance spring for increased resistance to magnetic fields. The watch includes a prominent big date display at the 6 o'clock position and is protected by a sapphire crystal with anti-reflective treatment. It is water-resistant up to 100 meters and comes with a stainless steel bracelet equipped with a butterfly clasp.