In order to allow a mechanical watch to stay as waterproof/dustproof as possible, today’s invention is one such watch with no winding crown to penetrate the case.
In fact there would be no route between inside and outside because the case would consist of a crystalline, transparent shell, formed by a process of computer-controlled deposition around the movement.
Setting the time would be done by having one of the hands made of soft iron. This could be rotated, using an external magnet applied to the front face and turned (This might also be used to wind the watch spring up, if turned anticlockwise).
