A wristwatch, comprising: a watch case (2); a clasp (3), said clasp comprising a frame (4) that can clip over the top of the watch case (2) in a closed position, and that can be unfastened from the watch case (2) in an open position; a bracelet (12), said bracelet comprising a single strand, said strand having a first end (120) and a second end (121); said first end being connected to said watch case (2) and said second end being connected to the clasp (3); a locking member (5) connected to the watch case, the locking member being able to be pivoted between a position that allows it to be inserted into the opening (40) of the frame (4) when the clasp (3) is being closed or opened, and a locking position that allows the opening or closure of the clasp (3) to be blocked.