Good day colleagues.
It's just from the photos and my opinion.
Emperor Francis has a clean, handsome bald head and patina above his head only between the letters How then?

Why is there a patina in the numbers and not elsewhere?

And what about here - the ancient patina is only next to the letters and why?

These are subtle indicators that the patina is not uniform throughout the coin and therefore has been tampered with.
Ahoj Ivan