I am looking at 2 Smiths. One is a stainless 2" snub with a SN of 96009 with a "T" stamped above and a "B" stamped below. It is a .38, but I cannot verify if it's a .38 S&W or a .38 Special. The other is a blue 4" with SN of 64162 with a "2" stamped above and a "O" stamped below. I know this one is .38 S&W CTG. Both have fixed groove rear sights and fixed front sights. Any history and insight you could provide would be very appreciated.