Hybrid timepiece oscillator

A timepiece oscillator, comprising at least one sprung balance assembly including a balance wheel set, itself including at least one balance rim and returned by at least one balance spring, wherein said balance wheel set is pivoted with respect to a structure, on a first side by at least one torsion wire, fixed by a stiff anchoring element or by means of a parachute spring to said structure, and on a second side, opposite to said first side, by a contactless magnetic pivot, said balance wheel set comprising at least a first pole embedded with said balance wheel set and said at least one torsion wire, each said at least one first pole having a symmetry with respect to a plane passing through the axis of said sprung balance assembly, said at least one first pole cooperating with at least one second pole comprised in said structure, for the magnetic suspension of at least one said first pole, and to exert on the distal end of said at least one torsion wire, opposite to said anchoring element, in a resultant magnetic field with axial symmetry, a magnetic force for axially tensioning said at least one torsion wire, for the axial holding of said torsion wire, and a magnetic force for radially centring said balance wheel set: