Your first coin is a Copper Plated Zinc Cent - The plating had Zinc Rot at one time and/or formed bubbles that popped. The second Cent looks like environmental damage. Here is a website I want to share with you to help you understand what to look for in Error Coins - Not a price guide, just a general guide. - http://www.error-ref.com/
Well, at least, you do have much better skills at posting quality images here than me, and frankly, most others. Ha, ha!
