What Does A Tea Stain Like Tone Do To The Grade Or Value.

I personally could care less about toning. As others have stated, toning does not affect the grade, it merely restricts your coin to the eye appeal of the owner/buyer within the marketplace. We collectors have varying standards of what appeals to us individually, but if it were me, I'd have no issue with your coin in its current state. In fact, I find your coin's natural toning gives it a nice patina and character conducive to its age. I'm not a proponent of any coin modification whatsoever, including dips, so I'd leave it as is.