Here's one coin that I will not be adding to my collection

The BBQ Pit
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The US Mint does make flat metal discs that it doesn’t call coins. They are called medals and have an entry in that glossary:

But yes, everything issued by the US mint with a face value on it can be spent at that face value.

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Look at that Superman one, for example. At one ounce it is the same size as a classic silver dollar. But since it does not have a face value, it is not called a coin.

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It almost makes me sad that there isn’t one for Gort.