What is the difference between these models? they all look very similar and seem to be made during the same time frame more or less. I am looking for an older steel frame revolver and these model numbers seem to come up the most. I have been looking at a 49 at a local pawn shop and that is pretty much what I am looking for. They wanted $500 for it and that was too high. I'll see if they have it in a couple weeks!