R. S. Lonati
Sieber, Rudolf
October 16, 1924 – April 27, 1990 (aged 65)
Birth place: Vienna, Austria
It appears that some of the artwork posted at the website rs-lonati.de is not by Mr. Lonati but was only attributed to him for similarity reasons. The most apparent example is the cover to Utopia #401, for which the canvas is signed "Gerhard Görner".