The reverse features Johann Friedrich Böttger.

Johann Friedrich Böttger was born in Schleiz (where the coin is from) and he was a German alchemist. He is normally credited with being the first European to discover the secret of the creation of hard-paste porcelain in 1708.
While explaining this to my daughter, she instantly recognized the alchemical symbols of
Earth

and the Sun

But this planet symbol is also a metal symbol, Gold.
Knowing that Newton, Sigismund III Vasa, and others were passionate about alchemy, do you have any coins with alchemical symbology?