What sort of Chinese Cast Coin do I have here?

This is one of four very similar that my father gave me.
Let me see if I can post the picture....
Let me see if I can post the picture....

Some call it an accumulation not a collection
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For Chinese coins of this period, the main difference between the coins of the various emperors are the two characters at the top and bottom; the two characters at left and right are almost always the same.
Roman emperor Marcus Aurelius, "Meditations"
Apparently I have been awarded the DPOTD twice.