Hi Everyone, I found this button in with a box of sewing items I got from an EsTate Sale. I enjoy researching but I can’t find out anything about this. It’s plain brass on the top, & measures 13/16”. The back has a shank similar to a birdcage. There are 3 small stars on one end with a curved line underneath them. On the other side are the words SIN RIVAL. My first thought was military because of the look and the stars but that was a dead end for me. I will appreciate any assistance.