Yes, it really exists, Mew2 has/had the same coupon and made a thread about it a few days ago.
Mew2 said that when clicking on "view applicable games" the main store page is displayed.
Edit: here's the thread (if only people would use useful titles, so you can find stuff easily ...)
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Nah. I added him and let him know that it's just a bug.
If you set your language to something else on the steam website and then view the same coupon, you'll see it's for No Time to Explain. He promptly removed it from steamtrades when he tried this out himself. :)
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saw this on steamtrades
http://steamcommunity.com/id/cODrlN/inventory/#753_3
does this really exist? the other guy claims that it is applicable only to the game No Time to Explain
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