Abstract: In the case of a wristwatch (1) with a clockwork (13), which is surrounded by a case (4) and is operable by means of a winder (20) fitted in rotary manner to the outside of the case (4) by a spindle (7) guided through said case (4) and in which the winder (20) is constructed in sealed, screw-in manner, incorrect operation is largely avoided in that signalling or indicating means are provided in operative connection with the winder (20) and indicate whether or not the winder (20) is in the screwed in state.