As you know I am more of a technical grader than an Eye Appeal grader. There are areas in the spots that I would call too heavy/thick. But, with out a 10X you really can't see the build up. It looks dark but natural.
May grade UNC details environmental damage with what’s going on on the reverse. If it ever ended up in my collection I’d sell it. I could never look past the dark splotches. Unfortunate because the obverse is very nice.
Peace Dollars don't tend to reach the monster level often (I'm not one that will give it a bump for color score just because most can't reach the levels Morgans do-although some will). Here are a few examples (not mine) that I would consider high end for a Peace Dollar (although not sure I'd go monster on them): https://www.greatcollections.com/Coin/498915/1922-Peace-Silver-Dollar-PCGS-MS-66-Toned https://www.greatcollections.com/Coin/780785/1922-Peace-Silver-Dollar-PCGS-MS-64-Toned https://www.greatcollections.com/Coin/591423/1922-Peace-Silver-Dollar-PCGS-MS-62-CAC-Green-Toned
I think that I might just try to let this soak for a few in acetone just to make sure none of this is PVC. There is some odd green color between the N and E on the reverse. Although I have a feeling that it may lighten the coin as a whole. Still a little leery of doing anything with the coin.
The market in terms of prices is different than the toning score/designation. I've seen mediocre toned Peace Dollars sell for solid to high premiums. I think your example is mid-high (in the 4 range going by the 1-6 scale and perhaps giving some leeway for it being a Peace Dollar); however, that could be knocked back into the 3 range if the spots are bad enough to make it go details. And I think your coin would sell for a nice premium even raw to someone who appreciates toned Peace Dollars.
No, fixing this coin the "right way" is called "coin doctoring." Sending it to a conservation service with instructions to remove the toning and spots from the reverse only, might not cross that line. However, if the reverse is dipped and comes out nice, adding artificial "skin" or color is also coin doctoring. That is something the Conservation Services claim they do not do.
Sorry, but the coin is the OP looks like "a better coin through chemistry" to me. It would be a firm pass on my part.
I may try working on just the reverse, see how it comes out. Thanks By the way I picked up another toned Peace dollar today. I need to get some pics.
I can't really tell the nature/composition from the images. When addressing any conservation project I always recommend the Polarity Ladder as a starting place: https://www.lincolncentforum.com/fo...0-The-First-Steps-to-Proper-Coin-Conservation You first have to eliminate the potential of a simple surface residue and this process will address that without damaging the coin. After that, I 100% defer to Insider - he's the in-house expert with silver. Given the advanced stage of the toning (near terminal), I'd be surprised if it could be helped.