Water-resistant watch case

A water-resistant watch case, for a diving watch, the case comprising at least one crystal mounted on a portion of a middle, a fastening gasket of the crystal being disposed between an annular inner wall of the middle and an annular outer wall of the crystal,

• wherein between the annular inner wall and the centre of the watch case, the middle comprises an annular inner surface inclined at a defined angle smaller than 90° in relation to an axis perpendicular to a plane of the watch case and coming into direct contact against an annular peripheral surface of the crystal, the annular peripheral surface being inclined at a same angle as the inclination of the annular inner surface and disposed below the annular outer wall of the crystal, and
• wherein the annular inner surface comprises a domed contact surface portion with a convex curvature having a first additional radius (R1′) defining an annular contact line against the annular peripheral surface of the crystal.

A water-resistant watch case, for a diving watch, the case comprising at least one crystal mounted on a portion of a middle, a fastening gasket of the crystal being disposed between an annular inner wall of the middle and an annular outer wall of the crystal,

• wherein between the annular outer wall and the centre of the watch case, the crystal comprises an annular peripheral surface inclined at a defined angle smaller than 90° in relation to an axis perpendicular to a plane of the watch case, in that between the annular inner wall and the centre of the watch case, the middle comprises an annular inner surface inclined at a same angle as the angle of inclination of the annular peripheral surface, and coming into direct contact against the annular peripheral surface of the crystal, and
• wherein the annular peripheral surface comprises a domed contact surface portion with a convex curvature having a first radius (R1), whereas the annular inner surface comprises a domed contact surface portion with a convex curvature of a first complementary radius (R1′) defining an annular contact line against the annular peripheral surface of the crystal.