Abstract: The device includes a cover for concealing or revealing a crown, via a relative rotation of the crown and an external casing element. In a preferred embodiment, the cover is secured to a ring slide friction mounted in an annular groove at the base of the middle part and held in place by a washer provided with lugs in order to be screwed into the horns of the middle part.

Abstract: The invention concerns a watch including a case having a middle part and housing a watch movement having a time-setting stem in a first peripheral region, said movement further including a first and a second control member which are arranged on either side of the time-setting stem and which each have an angular shift of less than 90° with the time-setting stem in relation to the centre of the movement, the watch further including an actuation device including a first and a second push-button arranged on the case in proximity to the movement, for respectively actuating said first and second control members, said watch being characterized in that, between each of said first and second push-buttons and said time-setting stem, there is an angular shift greater than 90° in relation to the centre of the movement, in that said first and second push-buttons are arranged in a second peripheral region of said watch movement, in that said actuation device further includes a transmission mechanism extending between sa