I have a pretty good idea who made this beautiful brooch, but I can't find it in my jewelry books. There are dog teeth around the large stone, some stones are unfoiled and open backed, and there is a blob of solder on the bottom back. 1 1/2" by 1 1/4", sturdy safety clasp. Carroll (301) says that a one piece pin finding was seldom used. Excellent vintage condition. The light scratches are not visible to the naked eye.