Manufactured in 1945. Blade front and adjustable rear sights, with the two-line address and patent markings on the left side of the slide and "COLT SERVICE/MODEL <ACE> .22 LONG/RIFLE" on the right. "GHD" inspected frame, with "UNITED STATES PROPERTY" above the serial number and the Ordnance Department "crossed cannons" mark on the right rear of the frame. Checkered thin hammer, stamped trigger and thumb safety, long grip safety, serrated slide catch and arched serrated mainspring housing. With reinforced Keyes Fiber grips and full blue Service Model magazine.