Its logical to think it was dbol, primo, and mayby winny since those were around at times and were popular. Test prolly was around too but it prolly wasnt used in bbing. If you look at the physiques of those days, including Arnie, they look pretty natural. Big and developed yes, but still a natural look. There weren't mass monsters those days with secondary muscle groups the size of your average athlete's quads. Arnie had great genetics, stamina and determination. When he says gear helped about 5% I absolutely believe him - in his case this was indeed so.