A timepiece case band including a peripheral shoulder in which an annular rotating bezel system is rotatably mounted. The rotating bezel system is an independent module including an annular bezel, an annular support element, a toothed element, and a spring mechanism cooperating elastically with a snap-fit mechanism, the spring mechanism and the toothed element being axially retained by the bezel and/or the support element. The rotating bezel system further includes a securing mechanism securing the spring mechanism, support element, and bezel to each other.