Home Hot News CST-01: World's Thinnest Watch CST-01: World's Thinnest Watch Author - personSatisfaction 11:25 AM share This is the CST-01, which at just 0.8 mm thick (Steel Watch) is thinner than a credit card and also the world’s thinnest watch. Charge battery for 15min and it will last long 15 years! Tags Hot News Facebook Twitter Whatsapp Newer Older