Most likely Prussian, though it could also be from one of the smaller neighbouring German states that used the same reverse; a pic of the other side would help confirm that.
Waste no more time arguing what a good man should be. Be one. Roman emperor Marcus Aurelius, "Meditations"
Comments
An illegible picture of an indeterminate size round piece of copper or bronze that probably has something stamped on it.
You really need to photoshop that picture to lighten it and add some contrast.
8 Reales Madness Collection
(Seriously, though, it does appear to be a Prussian silbergroschen.)
Roman emperor Marcus Aurelius, "Meditations"
Apparently I have been awarded one DPOTD.