Timepiece

This timepiece has a case (8) enclosing a horological movement (10), and a transmission mechanism for transmitting constant-velocity rotary movements between two stems (1a, 1b) on parallel axes, connecting the outside of the case (8) to the horological movement (10) through a hole in the case (8). The adjacent ends of the two stems (1a, 1b) are connected to two respective sliding elements (3, 6) having defined cross sections engaged with two respective slide-ways (4, 7) having cross sections complementary to those of the sliding elements, having sliding planes perpendicular to said axes, the two slide-ways (4, 7) being connected to a common linking member (5) and being oriented at an angle of 90° to each other.