I have one of these and I changed out the grips for some purty wood grips. After 50 rounds I put a pair of Houge grips on it. lol This one loves to bite the hand that feeds it. lol
This is my favorite S&W Wheelgun. Sweetness to shoot. J&G Sales has the 64 & 64 DAO still available to buy. I have had mine for a few years. My guess is Police Surplus.