Abstract: A writing utensil is provided, such as a ball-point pen having integral stamping equipment, which includes:a stamp and a stamp pad arranged on supports which are articulated by pivoting about axes perpendicular to the longitudinal axis of the writing utensil between positions approximately parallel to the longitudinal axis and positions approximately perpendicular to the longitudinal axis, anda removable cap which friction locks on the supports when the supports are in the position parallel to the longitudinal axis, so that the stamp rests disposed against the stamp pad.The support for the stamp pivots at its center point on an extension of the rear part of the writing utensil. The extension, rounded off on its outer side, extends to a length corresponding to one-half the length of the stamp support.