Device for protecting access to the winding mechanism of a pocket watch

A mechanical watch comprising a case inside which there is housed a watch movement including means for accumulating mechanical energy and winding means for providing mechanical energy to said accumulation means, said winding means comprising a stem that is accessible from the exterior through an aperture of said case, the stem being arranged to be driven in rotation with a winding key, wherein it comprises a moving element able to move between two end positions, elastic means being arranged inside said case so as to hold said moving element in a first rest position in which it cooperates with said case to block at least partially said aperture, the second of said end positions being a winding position in which at least the distal end of said stem is released sufficiently for said accumulation means to be wound, and in that the moving element is moved towards its winding position due to the pressure exerted by the winding key on the moving element.