@1dbn, those are great pictures. I definitely see a gouge along the bottom of the D, but not sure that I see much of a remnant from an S. Moreover, I don't see an OMM listed on varietyvista for this date. With all that said, I'm not 100% sure so I'll be interested to see what others think.
Well this one is a normal mint mark with Machine Doubling on the bottom of the mint mark. The lines you seeing are either Die flow or die scratches. Nothing is raised. If it were a 'S' mint mark, it would be obviously raised. This is not the case on your coin. I checked the PCGS site, no images of the D/S. I check ed Heritage Coins and they've never sold one. But on a D/S you should see something like this nickel D/S:
Note how you can see the 'S' inside the mint mark and on top of the mint mark. Yours is a normal coin with Machine Doubling, damaging the bottom edge of the mint mark.