1954 NSF graded EF-40 by C.C.C.S.
http://img607.imageshack.us/i/1954nsf.jpg/
I believe it's the only one ever found in circulation as it's not in the book i own in grade lower than PL-60, it's a variety that was found in proof-like set only.
I found it in a CWR a few month ago