Found not one but two of these $1 coins that I can not identify. Both have just "$1" on the front side and on the back side it looks like a eagle with a snake in its mouth. The coins are smaller than a penny and golden in color. One is dated 2005 and the other is dated 2006. The only other writing on the coins that I can see is a letter "M" over the letter "o" on the front to the far left. Can anyone identify them?
Mark