The first one looks like two coins were glued together. It is hard to tell from the pictures as I can't day for sure if the Queen's image is raised or not. I like to think that I am wrong as this coin is from a reputable dealer (from what I hear anyway).
The fourth one looks like it was ground down.
The last one is from a known scam artist, and looks like a nickel with a scratch on it deep enough to show the copper plating beneath the nickel.
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