This "Thomas D.A." pistol was manufactured in the 1970s in Covina, California, by A.J. Ordnance with a limited production of approximately 1,000. The pistol is similar in appearance to a large Walther and has a very unusual double action only design. The double action only system has a unique patented stirrup locking system actuated upon correctly gripping the pistol, thereby locking the action for firing. The pistol has a polished blue finish on the sides of the slide with the remaining surfaces having a flat or brushed finish. The left front of the slide is marked "Thomas / CALIBER .45 ACP" with the A.J. Ordnance logo and three line address to the rear and the two-line patent information on the right side of the slide directly below the ejection port. Fixed sights and fitted with black checkered two piece plastic grips.