The case back is a part of the watch’s case (verso) and is composed of three distinct parts: the case back, the middle case and the bezel. The middle case hosts the movement whereas the watch’s bezel protects the calibre. As for the case back, is opposite to the bezel and supports the whole movement. Generally opaque, it can be transparent to enable to admire the movement. It can wear all kinds of decorations or information about the watch. On RESERVOIR’s watches, the case back has a 240° opening that reveals the patented movement.