Those are "souvenir" tokens, that were made and issued from 2004 to 2012. Some years are very tough to find (e.g., 2010) and other years are quite common. Your 2011 token is fairly common and you can find them in nice uncirculated condition on ebay for $15 or less.
"Discovery follows discovery, each both raising and answering questions, each ending a long search, and each providing the new instruments for a new search." -- J. Robert Oppenheimer
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Content of this post is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License. See: http://creativecommons.org/licenses...0/deed.en_US
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