What is a Swatch Skin Chrono? The Skin Chrono is the thinnest Chronograph the world has ever seen. This latest addition to the Swatch Skin types is just 6.6 mm thin. In designing the chronograph, Swatch fused function with looks, technical elegance and created an uncomplicated, minimalist profile. The Swatch Skin is a watch made for men and women that love to show cutting edge styling and technology.