It's time for all of us to go through our jars of post-wheat copper pennies to see if we can find something similar. Heaven knows, when I find pennies like this while metal detecting, I usually drop them into... a jar, and forget about them. Looks as if it's time to go back and take another look.
Since I have no idea what a Henway is, let me just suggest you google Henning Nickel...no, here http://www.error-ref.com/henning-counterfeit-nickel/
Post Mint Damage! It only copper. Copper is a soft metal. It only takes a little pressure to damage the surface of copper. But, don't take my word for it. Submit it to PCSG for grading. It's only $35 to grade that.