Some people try and gas slabs, but its almost always pretty obvious. Simply leaving it by the window wont do anything
I would not pay that kind of money for nice,if not spectacular toning. It is an attractive coin, and 1/3 of that price for me seems reasonable.
None of my Peace Dollars have any toning, but some of my Morgans have a very narrow strip of toning around the edge of them. I'm not a fan of toning. None of them have been graded. They are in some plastic coin holders. What would be the best way to keep the coins from furthering the toning?
I would keep the holders (with coins) with some new shiney copper cents or copper strips that you scratch ( emery cloth, metallic scrubber) up severely, together in a sealable plastic bag intended for food so they do not have PVC. Copper is more chemically reactive than silver, so the replaceable sacrificial copper can be changed when it changes color towards brown. The only good use for new cents IMO , Jim
It's a decent looking Peace Dollar. As already mentioned, color on these is harder to find so people tend to bid them up even when it's mediocre. This one is better than mediocre but I wouldn't pay as much as the first auction ($567.77). Someone took a risk bidding it up thinking it was a monster and so far hasn't been successful reselling it. Did they overpay? It's too early to tell. If the coin sits around for a while, that will suggest the winning bidder paid too much or isn't flexible on their ask. If it sells soon, then we know at least one other person thinks it's worth the price.
I got an offer from the seller on eBay, for looking at it. Needless to say, I declined at $875. The coin isn’t worth anywhere near that, in my opinion. I think $450-$500 is more like it. The toning is nice, but far from monster level. I would rate the toning 3 out of 6, where 6 is maximum.