Yours is a small mintmark with what looks like machine doubling, a closer shot would be nice. The only rpm listed in the CPG has a 'S' south of the primary mintmark. Definitely more info needed on this one.
An artist is somebody who produces things that people don't need to have. Andy Warhol
Have it looked at by someone who is has expertise in this area.
The Second Edition of the book: Strike It Rich With Pocket Change shows a couple of errors involving S mint marks for that year. However, my eyes are not good enough to tell if your picture looks like the pictures in the book (pages 107 - 108).