Abstract: A rotatable ring is fastened to a watchcase to an encircling, rotationally symmetrical shoulder extending in axial direction with respect to the watchcase. For this purpose an encircling groove is provided on the shoulder along an outer generated surface, from which at least two slots extend which are disposed distributed over the circumference of the groove essentially in axial direction to a face protruding toward the watchcase. Disposed on the rotatable ring are radially directed peg-shaped projections corresponding to the number of slots. To fasten the rotatable ring, the projections are inserted into the groove through the slots, which are preferably inclined with respect to a longitudinal axis of the watch. The projections can then slide along the groove.

Abstract: The crystal-bezel unit (1, 20) allows dismantling of the timepiece from above and can be moved rotatingly relative to a caseband (4), where a joining gasket (10) including at least one active portion is disposed between the crystal-bezel unit and the caseband. An optional fixing means (20) holds the fixed and rotating units together.