Please take photos of the cleaned item! Could be a medieval horse harness pendant.
Markus Wehmer 7.12.2023
Okay, not a horse harness pendant after all. You can now clearly see a Masonic symbol.
1
Jan 10.1.2024
Unfortunately, my inquiry to the German Freemason Museum did not result in a precise identification. The pendant is probably from the Freemasons, but the museum is not aware of this form.