Lostlake, I want to tell you my opinion, I just don't want to say that mine is the right way and others is the wrong way. Copper is a metal, when it has corrosion on it the corrosion is eating that copper. Hot peroxide does not clean corrosion it cleans dirt. Coin preservation companies like the NGC use a method of soaks in distilled water first followed by acetone, then xylol. If that does not get rid of the corrosion then they repeat the steps in reverse, and so on and on until the corrosion is gone. I would hot peroxide that coin (by the way, nice find) by putting it in a coffee mug with a couple inches of peroxide, then put it in the microwave and zap it coin and all. It helps heat up the coin and loosen things up. Get it boiling, my microwave I do about a min. and that gets it boiling. I leave it in there until it stops fizzing. then repeat this until it does not fizz. I then toothpick the heck out of it (unless this was a key date) (Of course if it was a key date I would just send it in to professionals) this will remove all the dirt, Then I put it in mineral oil (when I put them in olive oil it turned them dark color) This usually leaves me with the coin with a green patina. I have done, to my lesser value LC's, the NGC method after all this because I believe that corrosion is eating my coin and I want to stop that. I agree with everyone how your coin looks nice the way it is. I just feel it is being ate up as we speak.
I think you and everyone else would be surprised as to how good your coin would look after peroxide,toothpick, and oil. Yours has very good detail left and would come out nice. Just my opinion. I could show you pix of a couple I did the whole shebang to, I believe I have all the before and after pix somewhere in this puter of mine.
