Flying Pigs brooch/Pin

Large brass or copper safety pin w 10 pigs hanging from it! My mother sure had her own unique style lol. It’s either brass or copper and will need polishing. I do not want to polish her jewelry because I don’t want to risk using the wrong cleaners on it. I am Now starting to part w my mother's jewelry. My mother was the queen of the finer things in life and unfortunately she passed away leaving me the task of going through it all and to allow someone else to enjoy it!