A self-winding watch includes a movement connected to a winding device of a barrel spring including an oscillating weight pivoting around an axis A, a reduction wheel train cooperating with the oscillating weight to transmit the torque to the barrel, a storage unit for electrical energy, a photovoltaic cell arranged to receive the ambient light and charge the electrical energy storage unit, a control circuit connected to the terminals of the electrical energy storage unit and a driver connected to the circuit and coupled to the oscillating weight to displace it. The electrical energy storage unit, the control circuit an d the driver are integrated to the oscillating weight.