The article presents a fine red chalk drawing that was kept in private hands, without any known authorship, which the present author attributes to Giuseppe Maria Crespi, a great Bolognese artist of the late Baroque age whose graphic production appears not to have been prolific. Evident compositional similarities with an already known Crespi engraving, representing Saint Paschal Baylón in ecstasy, has made it possible to resolve the far from obvious critical history of the latter work, which bears the signature of one of the artist's sons, as well as his pupils and collaborators, but whose execution has in fact always been attributed to Crespi senior. In the author's view, the quality of the drawing under examination, in all respects worthy of an autograph, justifies attributing not only the execution of that etching to Giuseppe Maria but also responsibility for its invention. At the same time it offers up an additional opportunity to reflect on the relations between father and sons within the great painter's workshop in Bologna.