Test was identified long before, the germans started making and administering synthetic test in the early 30s, usa a little later, mid 30s
Ziegler recommended whatever dosages, the guys did the usual man-math of "if this works, I'll multiply it by 10" , ortiz was known for handfuls of dbol
I reckon the guys were on 100mg dbol minimum per day, and we're talking "then dbol", the real deal, not todays dbol.
Another can of worms, park, reeves, grimek had test (synthetic) available to use
I'm pretty sure because their ethics were so much stronger than todays bbers, they chose not to use that advantage.
Reeves mentions his knowledge of "juice" as a kid after few months of training and a guy at the gym asking if he was on. He said he thought it was oj or something, then found out it was steroids. If reeves had steroids around as a newbie, then they were around in the 30s for sure, but obviously because it was the holy reeves, and the blue collar grimek they wouldn't do it, even though it was legal , and not frowned upon, few knew of the existence, these moral rocks chose to take the high road...