Someone correct me if I'm wrong, but the "10-post" requirement is for the Buy/Sell/Trade forums only. First, welcome to the neighborhood, Kevin! It's best that you start your own thread and include good photos of both sides of the coin.
First of all, you should have used one of the other forums like "US Coins" or "Errors" and started your own thread. It doesn't look like you have anything special. The 1974 looks like someone marked it with a felt pen. The 1980 looks like it has been subjected to some kind of environmental contamination. You have to realize that there are billions upon billions of pennies in circulation at any given time, and copper is highly reactive. Just because you see something odd-looking doesn't mean it is anything special.
Why does it keep telling me that I have insufficient something to be able to post on any of the forums