19-3 is last of the good ones. The 4” & 6” were easiest to come by. The 6” was the bargain for several years. Every one wanted 4” or Snubby and the shorter the barrel the more the bucks, true on N frames too.
Just remember the m19 is a trade off. To make a gun that gave magnum carry to cops, they had to reduce package for weight. The 4” m19 is the best police revolver ever made. Their only drawback is durability with extensive shooting of magnum loads. You can shoot forever with 38sp ammo.