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			100% legit.  I own a complete set of Helmar Stamps.  There are a few reprints out there, but they are pretty easily detectable.  This one is not one of them.  I think the eBay authentication program is flawed, nothing wrong with the stamp itself.  You got a nice HOF rookie “card” too, which is why I presume you picked it up.
 Nice snag!!
 
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http://imageevent.com/derekgranger 
Working on the following: 
HOF "Earliest" Collection (Ideal - Indiv):  250/346 (72.3%) 
1914 T330-2 Piedmont Art Stamps......:  116/119 (97.5%) 
Completed:  
1911 T332 Helmar Stamps (180/180) 
1923 V100 Willard's Chocolate (180/180)
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