Speed Six: Usually Rounded Butt, fixed sights - but I believe
some were made with adjustable sights.
Service Six: Square butt, fixed sights.
All of the above were available in blue or stainless. Standard chambering was .357 Magnum although some were made for police departments in .38 Special.
The Security Six has an adjustable rear sight. The Speed Six and Service Six have a fixed rear sight. The Security Six has a square grip. The Speed Six has a round grip. The Service Six has a square grip. All made in .357 magnum. Speed Six and Service Six also made in .38 special and 9mm. All had 2 3/4" or 4" barrel. Security Six also had 6" barrel.
