Self-winding mechanism for watches

A watch comprising a case containing a movement and at least one energy accumulator recharged with energy by at least one winding mechanism, wherein said watch is arranged to receive, attached to said case or to a bracelet or strap or to an external component of said watch disposed in immediate proximity to said case, at least one additional self-winding mechanism arranged to be worn by a user at the same time as said watch and comprising at least one transmitter wheel set arranged for contactless cooperation with at least one receiver wheel set comprised in a said winding mechanism, by remote interaction under the action of at least one field in the air-gap between said at least one transmitter wheel set and said at least one receiver wheel set, the intensity of said at least one field and the maximum air-gap distance being defined to transmit to said at least one receiver wheel set, to charge with energy said at least one energy accumulator, a torque or a force imparted by any movement of a user to said at least one transmitter wheel set, wherein said at least one field is magnetic or electrostatic, and wherein at least one said additional self-winding mechanism is removable and portable with respect to said case.