They are like "Challenge" coins. They are not to be spent. The term "coins" have been around for years. The military and various organizations use them. These are Marine Corps "Challenge" coins: http://usmcshop.grunt.com/Search.aspx?search=coins Quoting Kim <kimharch@cut.net>:
OK, I saw NASA’s ad for the Hubble commemorative coins, but they don’t seem to be approved by the US Mint. In other words, they are not legal tender. I think the ad is misleading and should designate the “coins” as “commemorative medals.” Am I wrong?
Kim
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