Edelweiss: purchase the revolver, contact S&W and tell them you have purchased a used revolver you wish to send back for refinishing. They will bead blast the piece (as Slufoot suggested) and blue it. The result is a very nice looking matt finish quite similar to the finish on the older Highway Patrolman.
I sent them a 6.5" M29-2 and had it rebarrelled with a 4" stainless Mountain Gun barrel, bead blasted and blued to match, and it looks like I'm packing my old Highway Patrolman.
Also, if there is anything else you want them to do, such as check the revolver for wear or to replace any parts, let them know up front and your revolver will come back to you looking, and acting like new. Mikey.