This is an early Lost Castillo brooch with a transparent medium blue glass focal point with pointed leaves and a drop. The brooch is 2 1/8" wide and 2" tall with a sturdy safety clasp. It has the inventory number of 778. Additionally marked Los Castillo, Taxco, sterling, Made in Mexico. Weighs half an ounce. Excellent vintage condition. Made before 1948 since there is no tax stamp.