Water-resistant watch case

A water-resistant watch case for a diving watch, the case comprising:

• at least one crystal mounted on an upper side of a middle part,
• a bezel positioned above the middle part,
• wherein the crystal comprises an annular peripheral surface to be fastened by a metal gasket of the watch case, that is annular in shape, on an inner annular surface on the upper side of the middle part,
• wherein the annular peripheral surface of the crystal is inclined towards the inside of the watch case at a determined angle less than 90° relative to a central axis perpendicular to a plane of the watch case in order to distribute stresses between the crystal and the middle part due to the water pressure during a dive,
• wherein the metal gasket is one piece that includes a first portion arranged between the annular peripheral surface of the crystal and the inner annular surface of the middle part, and a second portion in contact between an inner annular wall of the middle part above the inner annular surface and an outer annular wall of the crystal above the annular peripheral surface, the first portion and the second portion of the metal gasket are linear and are directly connected at a bottom end of the second portion and a top end of the first portion, and
• wherein a top end of the second portion is positioned below the bezel.