“The muscle cars gave everyday Americans the opportunity to experience the rush of driving a fast, powerful car,” said Postmaster General Patrick Donahoe. “Just looking at the stamps evokes a feeling of speed. As Forever stamps, they’ll always be good for mailing a First-Class letter anytime in the future. And when you think about it, that’s fitting. Because these stamps—just like the great cars they represent—are timeless.”
The Muscle Cars Forever stamps are the third issuance in the America on the Move stamp series. The artwork was created by Tom Fritz of Newbury Park, CA
http://about.usps.com/news/national-releases/2013/pr13_029.htm