I think you got a GREAT price on it! I just recently put one on layaway yesterday for 439 OTD. I was looking it up and here we are. I love 3rd gen Smiths and when I saw this in the case I knew I had to have her! It's a DAO sibling to the 4006, of which I have two, one being the TSW. I kinda thought the DAO action was going to be a turn-ff but oh man, it's a beautiful smooth and relatively short action!
My 4046 is a Brinks gun too, and in great condition.
Congrats to both of us!
ETA: Does anybody know if all of the Brinks guns were the TSW? I don't remember if mine had the rail or not, but pretty sure that it didn't.