Abstract: The invention relates to a watch case comprising a case middle (16), a bezel (18) mounted so that it can turn on the middle and defining between them an annular chamber (36) and a gap (40) open towards the outside of the case, a glass (22) mounted in sealed fashion on the bezel, a seal (42) inserted between the bezel and the middle and arranged in said chamber (36). According to the invention said seal comprises a ring (44) of annular shape made of a material of the highly elastically deformable type, of annular shape, and the cross section of which comprises two lips (44a), one bearing against the bezel (18), the other against the case middle (16), and a compression member (48) arranged in said chamber on the side of the gap, inserted between and collaborating with said lips in order to compress them against the bezel and against the case middle, respectively.