Pre-Lock Smith and Wesson K or L frame in .357 mag.
K Frames are the most elegant revolvers in the world, with a grip size that fits all shooters and outstanding balance. Some early Ks got battered by folks shooting new fangled 125 gr hot ammo. If you stick to 158 gr ammo, the K will last a lifetime.
The L frame corrected this issue by beefing up the frame and adding a full underlug while keeping the grip size the same. Pretty guns, but balance suffered.
If you think you'll never want to shoot .357 (you'll probably be wrong

), you can snag a nicer model 15 (4" barrel) or 14 (6" barrel") in .38 special. The Model 19 (.357mag in 4" or 6") is a beautiful gun.