During WWII, the American company Coro Jewelry contracted with Hector Aguilar, famous Mexican jewelry artist, to make certain pieces for them. This was because Americans could no longer use silver for jewelry; it all went toward the War effort. These special pieces produced by Hector Aguilar's Taller Borda were marked, "Coro, Made in Mexico, Silver." They are all Hector Aguilar designs. This particular brooch/pin, with the exception of the little pistols, is shown in the book, "Mexican Silver, 20th Century Handwrought Jewelry and Metalwork," on pages 105 and 111. In excellent vintage condition. Lovely patina but could be cleaned if so desired. pin mechanism works fine. Measures 2 1/2 x 2 1/4. Thanks for looking.