Thx for posting the weight @anna. This piece is almost 2 g heavy despite having what appears to heavy circulation wear and a bit of edge shaving. I'm nervous about this one.
Two next steps: please post a photo of the edge of this piece (it will be difficult I know). Second, you should measure the specific gravity of this piece so that we can start to see if it is actually silver or rather base metal.
"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