Here’s a very nice MS-63 graded by PCGS from many years ago. No doubt a grade higher today. Out of 20 coins in a plastic PCGS box, all stored under the same conditions for the 20 plus years, this is the only coin that toned after being slabbed. The obverse is a lovely blue/green with a touch of red/orange toning. Hard to capture in the photos. The reverse is untouched and shows a clash. To the left of the top of the wreath under the Eagles wing. A smaller clash barely shows just above the arrows. There were 9,730,000 minted and a large number have been graded. A common dollar that in 2018 sold for under $50.00 at auction. I’d bet it would go for more than $100.00 today. I’ve had this one for well over 23 years, maybe longer, so you can imagine the low, low price i paid. And it was already slabbed. It has the old green label.
Guessing that it was cleaned and re-toned. I have a MS mercury dime tone free and 5-7 years later it toned up like the color of your Morgan dollar.
Maybe a dipping but I don’t see any signs of a cleaning. There are some marks on the slab. Between the coin and the slab photos were difficult.
A beauty of a reverse as so many are, but this one is extra-nice IMO. Oh, and while it may be "the old green holder"...it's not THE old(est) green holder of the "rattler" variety and what looks to be type-writer font/ink and tear-off marks.
It’s a form of cleaning but it doesn’t harm the coin if done correctly. You can over dip which will harm the coin but even that leaves no scratch marks.
