Oscillating body, mechanical oscillating system for wrist watches having such an oscillating body and watch having such an oscillating system

An oscillating body for a mechanical oscillating system of wristwatches, comprising:

• a plurality of mass weights arranged at even angle distances around a middle axis of an oscillating body, each of the plurality of mass weights has a mass center of gravity that is radially offset from an axis and can rotate or swivel on the oscillating body parallel to the middle axis of the oscillating body, wherein each of the plurality of mass weights is held by a press fit with at least one projection in a bore hole of the oscillating body formed axially congruent with the axis (AM) of each of the plurality of mass weights, and wherein the at least one projection has a same diameter as a diameter of the bore hole and each of the plurality of mass weights is held on the oscillating body by a permanent deformation of a partial section of the at least one projection to form a deformed section, and wherein the oscillating body is made of a metal material which has a density greater than 10 kg/dm3.