a timepiece includes a first and at least one second removable accessory , a locking system that is activated to rigidly connect the accessories to the timepiece and deactivated to detach the accessories from the timepiece , the locking system including a locking member that is movable between an operative position and an inoperative position for locking and unlocking the first accessory , respectively , a safety element which is automatically activated upon the unlocking of the first accessory , and which prevents the complete removal of the first accessory from the timepiece , and a blocking member for preventing the separation of at least one second accessory from the timepiece , the blocking member consisting of a functional portion of the first accessory .