I was looking closely at this Kennedy Accented Hair half dollar and it looked like it had scratches on the shield on the reverse, so I enlarged it through a camera and there appears to be a blob on one of the raised bars on the shield. Has anyone seen something like this. Is it a die crack/cud error? Is this typical of these 64 proofs? This entire coin seems to have some other roughness, although as a whole it is a very nice proof coin (when not observed in such detail).