Watch with a rigid casing-up, and casing-up method

A watch with a rigid casing-up, comprising:

• a middle;
• a bottom;
• a movement;
• a casing-up ring in contact with the middle;
• and
• a tightening element;
• in which:
• the casing-up ring has an inner peripheral face, wherein a profile of the inner peripheral face of the casing-up ring comprises at least one zone Z, the tangent (T) to which forms a first non-zero angle (α) of less than 90 degrees with an axis (X) passing through a center of the movement and perpendicular to a plane formed by the movement;
• the movement has an outer peripheral face, wherein a profile of the outer peripheral face of the movement comprises at least one zone Z′, the tangent (T′) to which forms a second non-zero angle (α′) of less than 90 degrees with the axis (X);
• the inner and outer peripheral faces are in contact with each other in the Z and Z′ zones,
• the tightening element is configured to apply a pressure on at least one of the movement and the casing-up ring, and
• in an assembled state of the watch, one of the movement and the casing-up ring is position-adjustable in an axial direction by frictional sliding contact between the zones Z and Z′, and the other one of the movement and the casing-up ring is blocked against an abutment, so that the movement is subject to an adjustable tightening pressure in simultaneously the axial direction and a radial direction.