One cent.
http://en.wikipedia.org/wiki/50_State_Quarters I might also suggest getting the redbook.
http://www.dc-coin.com/1grabenercoinpressmedallionsaleprice-1.aspx D. Carr probably made it.
You've got 45 cents total there. Both are post mint damage.
I wouldn't touch them.
Buy stabbed coins and crack them out of the plastic.
Who said it's rare and valuable?
They are plated outside of the mint we call it PMD (post mint damage), for a damaged coin such as that, I'd give a couple American cents for it.
A coin struck through grease is pretty common, and not worth much (if any) over face, I'd leave it the way it is.
Separate names with a comma.