Note on cleaning:
This find has been cleaned chemically or mechanically, which can lead to the destruction of the intact patina and surface of the find. All finds should first be presented to the responsible archaeologist for identification in order to decide on further cleaning.
You can still easily see the 2 Pfennig, but the cleaning is making the imprint weaker. I fear the rest of the patina and structure will disappear if it is cleaned further. On the back you can easily see the ruler's mark. Dating should be 18xx. It could be this coin: VT-H6893FYV