Despite the envelope that accompanied the piece, the information in it did not inspire confidence. Looking for the Numista I believe that the piece in question is the one of the link below. In the image the detail of the date that I understood to be correct.
I ask the help of someone who has mastered this kind of material to help me classify the piece accurately.
Thank you!
PS. I do not know why I keep collecting these pieces "lost in time".
http://en.numista.com/catalogue/pieces69548.html