You can usually see part of the S on top of the D. I don't see any. Better pics with lighting all around the mintmark needed.
Go to the website listed below. On the middle right of the page, there is a blue box that shows a Jefferson Nickel RPM Book download. It is an extremely extensive, detailed list of all of the RPM's. It shows you a clear pic of each RPM recorded for each year. http://varietyvista.com/index.htm
YeA get yourself of the cherry pickers guides and check the online resource coneca ... These will help dramatically