I guess I'll answer my own question. SA advised that it is a Model PB9501 and was manufactured in Oct of 1994. It is a Champion sized model - short butt with 6 round magazine, a 4" barrel and a steel frame. Apparently they were made in 2 basic configurations. Mine is made on the Mil-Spec platform. The 2 piece, full-lengh recoil spring guide has been adapted from other SA 1911 parts and did not come standard with the gun. It also has aftermarket hammer, trigger and sear, supposedly Wilson.