It is raised, I think it is a die gouge or crack.
I saw another image of this coin and forget what link in my favorites will take me there. I searched and googled but nothing came up last night and I looked pretty hard. Thus explaining the late night post.
Thanks
nlp coins - Noel for looking.
Yes, it has been a tough one to find.
Not that it is worth anything. It was fun to get though! As soon as I saw it I said "There it is!"
There will be no doubt when you find one.You will know immediately that it is one of these. No maybe about it. So I hope others will look and find one too now.
Still need a 1946 D over inverted D ( Could have sworn I had one of them. I also would hope to get a 1953 D over inverted D someday.
I have these odd varieties
1939
DDR1941 S large S
1942 D over Horizontal D
1943 P 3 over 2
1943 P double eye
1944 Henning no hole in R
1945 P
DDR1946 S "hockey stick"
1949 D/S
1954 S/D
1955 D/S
1955 Proof Triple Die Reverse
1964 Proof Triple Die Reverse
a few other proof doubled dies
1990 D no FS initials
An Adolf Weiss PAK club token
The .999 silver Unc and Proof 1938 FSNC (2002)
Felix Schlag pattern
Jefferson nickels.

and uh .... there seems to be another I can't remember what that was .... OH YEAH!

The 1971 Proof No S Nickel! My favorite coin!
