I't would be hard for me to keep the gun with the finish like that. Not that it has anything what so ever to do with how it shoots. It's just the looks of a buff and re-blue that would irk me.
I like an orig finish,, even at a well worn % much better than a buff and reblue job. Just my personal opinion though.
That said,,it's something you should have pick up on right off the bat.
In any other situation it would have been a $350 lesson learned,,and we have all had out share of them if we are honest with ourselves.
$350 is still not all that bad for the revolver as a shooter in nice mechanical condition, nice bore, ect.
But IF it's going to haunt you everytime you look at that reblued finish ,,,then take the gent up on that generous offer to refund your $$ on the pistol and go looking for another.
You owe that seller a big favor,,he really doesn't have to do this and most would not especially on a face to face deal.
A big lesson learned for you, but no money out of pocket in learning it this time if you want to get out from underneath that particular revolver.