1949 vintage ladies auxiliary of San Francisco club pin

1949 vintage digging for gold ladies auxiliary of San Francisco club complementary pin. It’s pretty heavy. I don’t know exactly what it’s made out of. The top is a pickax, shovel, and gold Nuggets on the backside where the pin part is says compliments of ladies auxiliary club of San Francisco September 1949 around the side of the pen says 30th convention international association of printing house craftsmen. Purchased at a thrift store and I just thought it was so cool and maybe somebody has a family member who was part of this club that would want this pin back in their lives. Measurements are.1 1/4 inch diameter I’m assuming it’s brass. It’s just a really neat pen for somebody’s collection.