Certina Watch DS Podium Big Size Chrono GMT Aluminium Quartz C001.639.97.057.01. The mens quartz models combine advanced technology with exclusive design. These watches, in 316L stainless steel, are genuine all rounders equally great for sport as for day to day leisure wear. They are tough, thanks to the Certina DS Concept, with sapphire crystal and water resistance up to a pressure of 10 bar 100m. At Certina, reliability is more than just a word.