Starting in 1975, he worked for about three years for the Argentinian publisher, first living in the country for a year, working in the Nippur IV studio (which was named as the classic Argentinian "historieta"/character "Nippur de Lagash"). In the morning he worked in the Kabul art (scripted by H. G. Oesterheld), and in the afternoon he worked at the Nippur studio, as an assistant to Ricardo Villagrán; or rather a ghost artist. Among others, he worked on "Mark" (doing full pencils starting with issue seven). After that year he moved back to Uruguay, working there and traveling once a month to Argentina. By then he was working on several Nippur studio characters, but on his own, and signing his own name. Eventually, tired of Ray Collins' (Eugenio Zapietro) scripts, he signed his Kabul art with aliases, such as "S. Gneis" or "Kopy"; using the latter when he had to copy another artists' styles.