I am new to this site and I found it because of your question on coins. I like to collect coins and my husband is into it big time hobby. I handle money at my job and I am always looking for that special coin. I just wanted to say never clean or polish a coin. Any added scratches takes value away from the coin. I found a 1920 wheat penny a couple of weeks ago and it is still in good shape. Another thing to look for is silver nickles and to tell this is to look on the back of the nickle and see if there is a mint mark above the dome of the building and if there is, this nickle has silver content in it.