Very nice plate. I leave my items as they came out of the ground, but everyone is different. If it were mine, I would display it as is. The imperfections give it character. Good luck though if you decide to have it restored.
Don't see an SNY very often. Nice. I will say that more than a few of the dug ones I've seen have looked like yours. Wonder if the maker scrimped on the quality of the edges, as I've seen a higher percentage of these in rough shape. I don't have one, by the way - nice job.