I prefer the 442-1 to most other revolvers. I shoot mine more than the rest of my handguns combined. My thinking is the most important gun you own is the one that you have with you when you need it. I looked at a new one today with a DMF prefix so DDS would probably be within the last 3 or 4 years. Fairly recently S&W went back to rifling with the sharper lands and grooves which I prefer for lead ammo. Take a look down the bore of the DDS. If the rifling has a rounded off look it means manufacture was more than a year ago. Palmetto State Armory had the one I inspected for $359. You can't go wrong with a 442. The sights show up better than a 642, current guns have a blackened stainless barrel and cylinder, and you don't have to worry about the clear coat finish peeling like a 642.
Best Regards,
ADP3