I did find a similar hallmark by SMITH LORENZO or maybe LORENZO SMITH in another post to our wonderful website, but when I tried to find the reference to this maker I was unable to find it. And only the middle part of the hallmark matched this ring, there were other parts of the hallmark that did not match this ring. So I don't know what is going on, but it does look like a stylized "SL" or maybe a Pictograph.

