Filigree also known as filigrann or filigrane is from the Latin ‘Filum’ (thread), and ‘Granum’ (seed). Fine, thread-like wires of precious metals are twisted, shaped and soldered into highly ornamental lacy designs. The filigree design can also be built upon to create multi-layered designs, such as flowers. Often, a piece of metal, or a wire frame,is used to give substance to this delicate work. Filigree is an ancient art form with a rich history from the Greek and Phoenicians to contemporary designs. Used through all centuries by a lot of different cultures. A standard silver hallmark mainly used in Germany after 1884 but also often used in other European countries. Looked at lock and safety pin this is probably a bracelet from the 50s.