Not the best picture but I don't see what you're describing. Could just be a normal S mintmark with a die chip.
Yes, I understand that, but if you can base your opinion on the seller's photos, we should be given the same courtesy, especially since you're expecting the board to provide you with a value, to the best of my knowledge, of an unknown "variety". I see no evidence of an inverted OMM over RPM, and at least from the present image, tend to agree with Paddy.
Well there is something there even if its the guys photo, I'll wait for your photo of your coin when you get the item.