Timepiece resonator mechanism

A timepiece resonator mechanism comprising a pivoting weight arranged to rotatably pivot about a virtual pivot axis, said resonator mechanism comprising a first fixed support and a second fixed support, wherein a flexure pivot mechanism is attached to said second fixed support, wherein said flexure pivot mechanism comprises a rotary support connected to said first fixed support by a first resilient assembly and connected to said second fixed support by a second resilient assembly, wherein said second resilient assembly defines said virtual pivot axis with said first resilient assembly, said pivoting weight being attached to said rotary support or formed by said rotary support, wherein said flexure pivot mechanism is planar, wherein said first resilient assembly includes, on either side of said virtual pivot axis, a first outer flexible strip and a first inner flexible strip, joined to each other by a first intermediate strip stiffer than each of the latter, together defining a first direction passing through said virtual pivot axis, and wherein said second resilient assembly includes a second flexible strip defining a second direction passing through said virtual pivot axis, and wherein said second flexible strip is clamped in said second fixed support at a second outer clamping point, and in said rotary support at a second inner clamping point, and wherein said second outer clamping point and said second inner clamping point are located on either side of a straight line parallel to said first direction and passing through said virtual pivot axis.