Your new/old roll crimper is a Lyman tool. I think they were made in the 1950's

From what I can see, I'd probably just clean the rust with a wire wheel. But if the rust is more extensive on the collets, you might want to try using Evapo-Rust or a solution of feed store molasses and water. Evapo-Rust is a bit faster and the molasses method is considerably cheaper. Another option would be the electrolysis method of rust removal.

Voting for anti-gun Democrats is dumber than giving treats to a dog that shits on a Persian Rug