A friend at work showed me a quarter the other day and asked me it's value. It has a normal face and when I flipped it over the back was all copper with the normal back of a quarter. I researched a little and found that sometimes this happened as a mint error where they never plated the back properly. Anyone able to shed some light on this for me? If he is willing to sell and someone thinks they might be interested I will post a photo. Thanks for any help.