@hugo, I think you still assume it is fake until proven real. Next step is to perform a specific gravity test or take it to a pawn shop or LCS for them to non-destructively analyze the alloy.
I believe that this numista link is to the pattern that this is purporting to be:
https://en.numista.com/catalogue/pieces243346.htmlHopefully @albert can confirm.
"If you climb a good tree, you get a push."
-----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed."
-----King Adz