Suppose someone in the 1960's had bought a printing press of the same make/model as what was being used to print Marvel comics. Suppose they also bought a large supply of the same ink and the same paper and the same staples. They then wait.
Then decades later they can see which 1960's Marvel comics have become valuable collectables. The early '60s was when Marvel introduced Spider-Man, Thor, the Fantastic Four, Doctor Strange, Iron Man, the Avengers, the Hulk, the Black Widow, and the X-Men for example, many of which went on to fetch hundreds of thousands or even millions for mint condition copies.
They they use their vintage press, ink, paper, and staples to print mint condition forgeries.
What would their chances of fooling people be?