Stamping part so fitted inside the casing (3) of a stamp that it is movable in the vertical direction, pressed by means of a knob (4), which stamping part, to enable stamping, is provided with stamping pieces (10-12) placed in socket parts (19). The sockets are connected together in at least one endless band (16, 17) by means of connecting lobes (20) between the foot ends of the sockets so that the connecting lobes and socket foot parts form a band. Moreover, the stamping part has a vertical framework (7, 9) whose top and bottom ends are so rounded that the band can be revolved around said framework to select a desired stamp.