Vintage Mexican Abalone/Sterling Silver Butterfly Brooch

Vintage Mexican Abalone set in Sterling silver brooch. Marked on back 925 with initials RS or BS under 925, indicating the maker. Several small pock marks in bottom right wing,and light wear in upper right wing, see photo. Several sections of abalone irridesce very beautifully. 1 1/2” wide x 1 1/2” tall Brooch with open hook closure. Arrives in a gift box 🎁