I believe your gun is S&W stock number 149968. This is a special run of 1200 of the Model 37-2 with a bobbed hammer, case hardened hammer and trigger, no trigger lock, and it is DAO.

The finish is not Black-T, it's just the standard S&W matte black and to my knowledge there was no special trigger job.

I own one of these and paid $405 for it on Gunbroker about 1 year ago. I believe that would still be a reasonable price. Although I like the gun and carry it at times, I wouldn't say it's the "be all and end all" of concealed carry weapons.