When I first saw this coin, I thought die wear at the mint mark because there is some of that at the numerals of the date. Then I thought the area to the south looked too strong for die wear, so I thought possible RPM. Then I looked at it upside down and darned if it doesn't look like an S over horizontal D. Helpful thoughts are appreciated. Insults and useless cartoons are not.
Search the coin on http://www.coppercoins.com I looked and didn't see any listings for s S/D variety for that year
I looked at coppercoins and mine is similar to RPM008, but I am not convinced that it is the same. That resource notes no die markers and I have found some good ones. There is a unicorn die scratch from Abe's forehead and a couple more on the reverse. Die state could explain different markers, but in some ways mine seems later and in some, earlier. I have done a comparison of mint mark position and, again, mine looks slightly different from that of the 008. At the very least, maybe the markers will be useful to someone.
My 2cents I agree its 1MM-008 S/S. One thing all US 1c-50c + some World coins 1939-1945 were struck by men+women that were not the normal mint workers replacement workers.If you were not in the armed services fighting in WWII.you were working to support the war.
Having sold one of these a couple of months back, I can safely say what you have is one of many S/S varieties for this date/MM. With previous replies, I'm sure you'll be able to conclude the exact Fivaz-Stanton number. Some may say the anomaly looks like die deterioration... Well, they're right, in a sense. Die deterioration is typical on these Steel cents, making the overmintmark look much more dramatic than it actually is. You're coin looks like it's also been exposed to "the elements", worsening the deterioration. -Brian