The ASP was a custom made handgun designed and built by Paris Theodore, owner of Seventrees, Ltd. a custom gun leather shop in New York from the early 1970s to 1987. The ASP was based on the Smith & Wesson Model 39 pistol. The ASP featured clear Lexan grips allowing the shooter to see how much ammunition is left, a rounded hammer, hooked triggerguard and no front sight. The ASP was responsible for later innovations made in the development of concealable handguns.