I have seen a genuine Australian copper nickel Penny off metal strike, but that was on display in a viewer gallery at the Royal Australian Mint in Canberra.
From the pictures, I would say that this one is plated. My guess for the plating metal is nickel; there is enough shine for nickel. Most probably a victim of a plating experiment in a high school chemical laboratory.
A standard bronze halfpenny weighs 5.67 grams, diameter 25.5mm.
In all of my collecting experience, which covers more decades that I am prepared to admit, I have never heard of an off metal strike Halfpenny. A search of Google Images: "off metal strike halfpenny" fails to produce an image of an example, and Google Images is pretty good at searching such thing out.
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