Dating to 1915 by serial number in one of Springfield's assigned blocks. Blade front and flat top notch rear sights, with the two-block Colt patent dates and address on the left side of the slide, the Rampant Colt behind the serrations, and the model marking on the reverse. No inspector's markings are present on the frame, just the serial number, "UNITED STATES PROPERTY" nomenclature, and "H/G" and "H" on top around the disconnector; while not documented, this may be a replacement manufactured by Colt, swapped out for a damaged or destroyed Springfield frame and numbered to match. With a long smooth trigger, wide knurled hammer, short grip safety, checkered grips, two-toned pinned base magazine and a barrel marked "R" and "P" on the chamber hood.