On the obverse, that circular line is damage usually caused by a coin rolling machine.
On the reverse, if the line is raised above the coin surface, the die may have had a crack. Worth a little above face value for that, but the damage on the front would outweigh any added premium I am afraid.
The color change is fairly normal.

On the reverse, if the line is raised above the coin surface, the die may have had a crack. Worth a little above face value for that, but the damage on the front would outweigh any added premium I am afraid.
The color change is fairly normal.






















