Finally found a site that helps you determine a coin's error. I have this 1979 quarter with issues. I looks like an indent on the eagles chest, and a lump on georges throat. Also the leaves on the back, and the eagles wing have light images of leaves and wings...etc... real, fake error etc...
I'm pretty sure this is damage. Hope this helps---sorry it wasn't something else and I could give the good news! Speedy
Difficult to really tell for sure from photos. Try taking a better close up. However, dose appear to be post Mint damage.