Correct on the brillo pads, and more evident..the "burn" markings and the way it is completely glazed. Plus anytime the hooks/loops (depending on which arsenal made the plate) are missing it immediately raises a flag bc you can often tell an original from a repro based on how they are attatched to the back of the plate.
No harm no foul though..at least you didn't shell out hundreds or even thousands on a repro CS plate that many have and continue to make the mistake of doing.
I suggest Steve Mullinax's plate book..it's amazing and THE go to guide