I have this Bicentennial Quarter and noticed on the Obverse what appears to be a die clash to the left of Washington's head. Can someone please confirm this? Also, the other indentation on the Obverse to the left of the rim, is this a strike through grease error? Lastly on the reverse, I noticed 2 areas along the rim where it appears it was struck through grease. Is this common on Bicentennial Quarters?