Definitely a Perfected model, the ultimate S&W .38 DA top break. Too bad it's not in a little better condition. They are not often seen. Probably it doesn't warrant being called "rare" but it's certainly uncommon. .38 S&W ammo is still made, but most retail outlets don't carry it. You would probably be able to find a dealer to special order it for you. Some can usually be found at gun shows. Usually not cheap.