You are correct because I've read some of Eder's words regarding that period of time (Eder lived on the East Coast) and Marvin said Park was one of the few who could not only train with but keep up with Eder's poundages. Both men were incredibly powerful and I do not think they took any AAS. I think the time period was the late 50s or early 60s. Park was a proud Brit and a great man to boot. His son has written that his father denied using AAS and like Reeves, I believe the son because I believe his father to have been a man of honor.Here is an excellent article on Marin Eder - http://ditillo2.blogspot.com/2009/03/marvin-eder-gene-mozee.html