This sterling circle brooch has a round of crowns, that you will recognize the design from Margot de Taxco. The brooch also has a faux opal. The piece is 2 1/8" and has a working pin. Marked Anton, Sterling, Taxco, Mexico. There are no tax stamps or artisan's letters and numbers. This brooch was made before 1948. A little worn on the back but fine in the front.