The color and surface roughness are simply not what comes out of the mint. If you'd like to confirm that you don't have a missing clad error, then please weigh this coin. If it is within mint specs, then environmental damage is the most likely culprit. Here is a link to Mike Diamond's excellent error-ref website with more details about cladding errors:
http://www.error-ref.com/?s=clad
"If you climb a good tree, you get a push."
-----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed."
-----King Adz