Check out Anderson Silva in some amateur MMA action at the 1:35 and 5:35 marks. The video also includes early fights from Cristiano Marcello and Fabricio Camoes. I have no idea when these took place, but the video claims it’s some time in the early 90’s. From Portal do Vale Tudo with google translate.
The three beasts appear with many muscles and techniques unless a GP held in Campo Grande in the early 1990s. Anderson Silva emerged as the winner after beating the first opponent with a choke and go through Strawberry(Camoes).
That is probably terrible translation, but take it for what it’s worth.