One more hopeless coin [opgelost]

9 grams, 30mm, 100% hopeless for me:

Hello,

Your coin seems to be a french Sol of Louis XVI but the second picture seems to be in mirror : does your camera inverted it ?

https://en.numista.com/catalogue/pieces5466.html
https://en.numista.com/catalogue/pieces40926.html

Citeer: "Cycnos"​Hello,
​
​Your coin seems to be a french Sol of Louis XVI but the second picture seems to be in mirror : is your camera inverted it ?
​
​https://en.numista.com/catalogue/pieces5466.html
​https://en.numista.com/catalogue/pieces40926.html

​It really is similar to the coin you sent but it's not inverted, it's like this.

Moreover, it's not convex, it is concave. Do you know how this could be?

Interesting.

In this case it should be a striking error (a full brockage here) : the legend is inverted and the design matches with an incuse French sol.
Have a look here : https://fr.numista.com/forum/topic39251.html

Too bad it's that worn :s

Wow, looks like you're super great at this, thanks! Any idea how I can clean it at least a little?

Yes, lettering is backwards - I saw AIT letters but could find nothing like it, then
saw the last letter looked like a G in reverse, so is GRATIA when

> > >
rotated vertically, which then makes the portrait left-facing with GRATIA behind.