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1. A horological resonator mechanism, comprising a structure and an anchor unit from which is suspended at least one inertial element which is arranged to oscillate with a first degree of rotational freedom RZ about a pivot axis extending in a first direction Z, said inertial element being subjected to return forces exerted by a flexure pivot comprising a plurality of substantially longitudinal elastic strips, each fixed at a first end to said anchor unit, and at a second end to said inertial element, each said elastic strip being deformable essentially in a plane XY perpendicular to said first direction Z, wherein said anchor unit is suspended from said structure by a flexible suspension, which is arranged to allow said anchor unit to move in five flexible degrees of freedom of the suspension which are a first degree of translational freedom in said first direction Z, a second degree of translational freedom in a second direction X orthogonal to said first direction Z, a third degree of translational freedom in a third direction Y orthogonal to said second direction X and to said first direction Z, a second degree of rotational freedom RX about an axis extending in said second direction X, and a third degree of rotational freedom RY about an axis extending in said third direction Y, and wherein said resonator mechanism is a composite assembly made of at least two different materials, and which comprises said flexure pivot, which is made of a first material wherein a first Young's modulus E1 and by a first yield strength Sigma 1 and by a first modulus of rigidity G1, and, said resonator mechanism further comprising said flexible suspension, which is made of a second material wherein a second Young's modulus E2 and by a second yield strength Sigma 2 and by a second modulus of rigidity G2.
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