1944-P FIVE CENT PIECE - Shiny like a proof and sticks to a magnet - Plated ? With what?

I just posted this in the precious metals thread before I realized it was not the coin forum. Anyway maybe someone can tell me if this coin is plated and if so, what is it plated with since it sticks to a magnet.
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Staples on the 2x2 are magnetic.
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I just learned that manganese (9% of war nickels) is magnetic!
Your coin looks to have been polished, might be nickel plated.
https://terpconnect.umd.edu/~wbreslyn/magnets/is-nickel-magnetic.html
Collector, occasional seller
Chrome plating is somewhat magnetic.
Pure nickel is also magnetic so it could be nickel plated.
Thanks for the comments. As it turns out I have a 1943-P that is very similar to the 1944-P, which also sticks to a magnet. I don't know where I got these coins, I was just going through some of my old stuff I had put away years ago. I believe these are nickel plated, but I don't know why someone would do that.