In my opinion, this denarius is obviously genuine, but I sold it to a buyer who wants to return it because he believes it is fake.
In the interest of business integrity tell the customer that you do not agree with them but you will take the coin back. Just be sure that the correct coin is returned. Or you can offer to pay for a second opinion.
Personally, it looks good to me, @Jorge Santos . Mine to compare … RR Saturninus Moneyer 104 BCE Roma Saturn holding Sickle Quadriga 2 dots-V Sear193 Craw 317-3a var