We see a lot of Taxco silver animal, and human pins, but very few geometrics. This brooch is 1 1/2" X 1 1/2" X 1/4"+, and has 4 black jet wide strips, and 5 narrow silver stripes. The pin weighs 23.6 grams. The back has a safety clasp, and is marked "TH(or TN)-58,Mex. 925". The T is for Taxco, the H, or N, for the artist's name, and 58 because he, or she, is the 58th jeweler registered with that name. Someone needs to write a book on this system so we know who did what. This is a nice, heavy, unusual, vintage pin.