It's a huge find: an autograph from Henry Aaron himself, on a baseball. Except that the signature doesn't look like his, the kind of baseball came into use after Aaron retired, and so did the pen.
It would not be the first fake in history, and certainly not the last.
Lydia Pyne takes up some of the bigger examples of fakes in her book Genuine Fakes: How Phony Things Teach Us About Real Stuff.
Sure, there are forged paintings and "fossils" that are not old, but there are also ongoing fakes, like the banana flavor in candy.
We sink our teeth into that and more in this interview from 2019.