The invention relates to a wristwatch comprising: a middle having a side wall, defining a median plane and including attachment members for securing respective first and second ends of a strap to the middle, and a cover capable of pivoting, relative to the middle, between a first closed position in which the ends of the strap are locked onto the middle, and a second open position in which the ends of the strap are free to be separated from the middle, the cover being arranged so as pivot about a rotational axis parallel to the median plane, and each attachment member including a hole provided in the side wall and intended for receiving the corresponding end of the strap by insertion in a direction substantially parallel to the median plane.

The present invention relates to a display device having a rotatable display unit (12), the display device including: a display main body (10) having the display unit (12) for displaying various items of information; a rotary unit (20) combined with the display main body (10) and having a rotary weight (25) eccentric from the display main body (10); and a rotary base (30) combined with the display main body (10) or the rotary unit (20) to rotate relative to the display main body (10) or the rotary unit (20), in which the rotary unit (20) and the display main body (10) combined with the rotary unit (20) are rotated relative to the rotary base (30) and aligned in a predetermined direction by gravity acting on the rotary weight (25).

A convertible smart watch including a smart watch and an analog watch together, which is convertible between the smart watch and the analog watch at user's option, is disclosed. The convertible smart watch includes a frame with a through hole in the center, a watch body including an analog watch unit and a smart watch unit combined against their backs such that that analog watch be exposed to one side and the smart watch be exposed to the other side, which is rotatable inside the through hole of the frame, and a smart watch on-off unit to operate the smart watch unit, when the smart watch is exposed to the front of the frame and the analog watch is exposed to the rear of the frame.

A marine chronometer including a watch tiltably mounted on a support with a gimbal suspension, the chronometer support also includes a cradle movable in translation between a rest position wherein the watch is free to move on the gimbal suspension, and a holding position wherein the watch is resting on the cradle.