nice find! looks XF-AU, lots of lustre, not a proof, I dont think, but could indeed be from a mint set, but who knows. definately keeper, though quite a common date.
Jamais l'or n'a perdu la plus petite occasion de se montrer stupide. -Balzac
Nice find indeed! Am always jealous of people who can find silver in circulation. Should probably go to Switzerland some time, I've instructed a friend who lives there to set aside and send me old Swiss coins he finds in circulation.
I sometimes find coins in circulation like this one that have mirror-like fields that I wonder if they are proofs or not too, see this thread here: https://en.numista.com/forum/topic65892.html
I think with the hot last two mouths . The kids have been getting in the mom and dads coins. I have gotten a silver quarter, 5 silver dimes and a whole lot of nice stuff.