Awhile back, I began saving pre-1982 US Pennies. Many people don't know that before 1982, US pennies are 90% copper, making them perfect for a variety of jewelry applications. They can be annealed, domed, torch enameled, punched, cut, filed, hammered just like any sheet of copper! lucky Second Surf pennies, I've been using to sign jewelry I started out using them as signature tags for my jewelry, but this week, I made some buttons for a bracelet class I'm teaching... penny buttons for use in…