Saw on Pawn Stars (one of my favorite shows) that before 1982, pennies were 95% copper and after that time they had very little copper because copper became valuable. It still is. I just calculated that a pre-1982 penny has about 1.9 cents worth of copper. Ru-Jun and I started going through the change we had around and we are now saving all of the older pennies. Pretty fun.
Pre-1982 pennies July 31, 2013