Alpaca Mexico Inlaid Mother Of Pearl/Abalone Pendant/Pin Brooch-Vintage

Vintage combination pendant or pin brooch hand-made in Alpaca Mexico. It is made of silver with inlaid mother of pearl and abalone designs on the front, maybe even black onyx background. It was passed down in my family so I know it is at least 30-40 years old. It's in good condition on the front with no flaws but the back shows tarnished spots as shown in the pictures.