Abstract: The present invention concerns a mechanical watch (1), preferably of the pocket watch type, wound by a key. More specifically, the present invention concerns a protective device for the aperture (6) allowing access to the winding mechanism of such a watch, particular to the winding stem (7). For this purpose, a moving element (8) is implemented, mounted around the stem (7) and able to move between two end positions, first of all to at least partially block the aperture (6) in normal use and, secondly, to release access to the winding stem (7) in order to wind the watch.

Abstract: A winder assembly comprises a spindle provided with a threaded portion, a winder removably engageable with the threaded portion of the spindle and a holder for holding the winder in position when the threaded portion of the spindle and the winder are disengaged from each other, the winder being provided with a perforated guide having a diameter of perforation substantially equally to the diameter of the threaded portion of the spindle. Such an assembly may be suitably used for a music box containing an automatic instrument or the like because it can be easily fitted to a music box and used to operate the music box by simply rotating the winder. Moreover, the winder is provided with a hollow section having a diameter or perforation substantially equal to the diameter of the bolt section of the spindle, the winder can be hardly tilted to damage the stopper, or holder, and separated from the spindle to become an unintended hazard to little children.