I'm going to go with yes and no....but need to see the edge to confirm. I found a 2019P American Memorial Park with similar looks in a brand new roll from a brand new box of the same design roll hunting last year. 1999 coins all bright and shiny, and the one, looked like yours. your edge should be bright and shiny still if it is improperly annealed, the collar that adds the reeding wipes out the surface marks on the edge completely during the strike. Now, the reality is, this is a "more likely than not" type thing here's a link to the thread on here from my find. https://www.cointalk.com/threads/20...-park-annealing-error-or-eviro-damage.342452/ for me in the end it's a, "maybe, maybe not, but it left the mint that way". Kind of easier to spot when the coin is brand new release minted vs. a couple years old and found in change. Maybe
a little less close on the edge. trying to see if it has a brightness to it and if it looks "clean" so to speak.
Well, to me, more than not, it looks like it is what would be called an improperly annealed quarter or sintered planchet. However, you'd need to send it to a grading company and get one of their graders to agree with you on that and put it in a slab with that on it. there's a lot of skepticism on ungraded examples... even then, it's not like a "home run" they usually sell slabbed for less than the costs to get it slabbed. but if you wanted it for your collection, I can understand paying the fees to get it slabbed with it on it. the luster of the improper annealing error coin will typically be uninterrupted and flowing freely over the discolorations. Luster flow lines struck into annealed surfaces. in other words, the luster will still be there with the discoloration and when you turn it in the light it will still show the cartwheel behind the discolorations. Corrosion or environmental damage will disfigure or destroy luster. you'll lose the cartwheel effect. luster will be interrupted.
Hard to tell from the photo only, but I'd say yes, it's a lightly mis-annealed planchet. The reeding shows 'red' (the copper core), and a plated item (or enviornmentally damaged surfaces) wouldn't show the nice red copper core. It doesn't have the 'copper wash' red color some have, and it doesn't have that 'steel grey luster' that some have, but I don't believe it's been played with.
