The wristwatch with a reversible case (12) is provided with a wristband, each end strand of which includes an insert (30) which is pivotably and slidably mounted on the case (12) via a trunnion (32). Each insert (30) includes at least two indexed angular positions, which respectively correspond to two positions of use of the case (12), and at least one longitudinal rest position wherein the insert (30) is blocked from pivoting by a male element (36) fitting inside a female element (38), one of the elements (36) being arranged on the case (12), the other element (38) being arranged on the insert (30), and a longitudinal pivoting position wherein the insert (30) is shifted longitudinally outwards and wherein the insert (30) is free to pivot. The invention is characterized in that each trunnion (32) includes a first indexing element (48), which cooperates with a second indexing element (64, 66) arranged on the case (12) so as to index the insert (30) longitudinally.