http://doubleddie.com/1469129.html I'm not so sure about this one, Nolan... the coin's over all condition certainly doesn't help, but this strikes me as being more likely one of the "sheared" mintmarks common in that era.
For all you examiners of late 1950's and through the 1960's in Jeffnicks, what you will do well finding is some full steps. That whole era is loaded with blob steps. The idea that some newb somewhere is putting some full step nickels in a reject pile just because he can't find anything doubled on it makes me nuts!