Was just getting ready to list this outstanding genuine Jugendstil Cameo pendant. Turned it over and read the hallmarks with my jeweler's loupe. It says "OB"!!! I have been looking for one of these for years and did not even know what I had. This is the mark of Otsby Barton. He was a very popular jeweler C. 1900. His work is highly collectible and you want to know why? He perished on the Titanic!!