Certina Watch DS-1 Big Date Powermatic 80 Special Edition C0294261109160. Just in time for the 60th anniversary of the DS Concept, the DS-1 Big Date Powermatic 80 Special Edition marks 60 years of Double Security with enhanced resistance thanks to new anti magnetic technology. Sporty and elegant in all respects, with a cool Milanese steel mesh bracelet, superb green dial and easy to read Big Date at 6 o clock.