The watch according to the invention includes a movement (2) on which a dial (4) is assembled and which is mounted in a casing ring (12) itself mounted in a case (14) including a crystal (16) secured to a bezel (20), a middle part (24) and a back cover (22). According to the invention, the case (4) includes an inner tubular part (38) at least partially surrounding the casing ring (12) and itself surrounded by the middle part (24) and snap fitting assembling means (64, 76) for connecting the back cover (22) and the bezel (20) via the inner tubular part (38). Moreover, this tubular part is designed to allow the casing ring (12) and the middle part (24) to be angularly positioned with respect to each other. In order to do this, it can have an axial slot (98) open towards the back cover (22), which an external projecting portion (94) of the casing ring and an internal projecting portion (96) of the middle part penetrate.
