The .357 Lawman was the fixed sight version of the Trooper Mark III and was made to be a police duty revolver.
It's bigger than a K frame S&W and probably a pretty tough gun. As for value, I would put it in the $300-400 range like a lot of 4" wheel guns which are undervalued because of the 12.6 nonsense.
I prefer Smith & Wesson or Ruger but it is kinda of neat big blaster.