Certina Watch DS 8 Powermatic 80 C033.807.26.087.00. The modern, simple and sleek design of the DS-8 40.5 mm Powermatic 80 is enlivened by stark contrasts and boasts excellent readability. At the heart of the timepiece's inner workings beats a modern Powermatic 80 calibre with a Nivachron™ balance spring that is resistant to magnetic fields.