The present invention provides a watch
assembly equipped with means for transmitting torque or force through the watch casing using a magnetic coupler. [Solution] A watch
assembly 2000 comprising a watch 1000 and an adjustment tool 200, wherein the adjustment tool 200 drives an external drive movable body 20 to pivot around an external axis DE, the external drive movable body 20 comprises an external multipole
magnet 21, the external multipole
magnet 21 engages with an internal multipole
magnet provided in an internal control movable body 1 of the watch 1000, which pivots around a first axis D1 and meshes with the input of a reduction
gear train 30 in order to perform adjustment. The output of the reduction
gear train 30 meshes with an internal controlled movable body 1 that pivots within a case 10. The adjustment tool 200 comprises means for counting the number of rotations of the drive movable body 20 to accurately determine the degree of pivot of the internal controlled movable body 1, and / or means for determining and / or visualizing the angular position of the internal controlled movable body.