Help Identify 1911 .45 Barrel

I picked up a 5" 1911 barrel in a part purchase I did for a build I am working on. It has a marking on top of the barrel that says, "CAL .45 ACP". On the lug of the barrel it has the horizontal "S" marking that is usually associated with Springfield Armory, but I have researched their library of markings and it does not appear that they ever used the top of the barrel marking. Does anyone know who the manufacturer of this barrel is?

Your barrel has been made by Springfield Armory, from serial 72571 to 127978) (1914 - 1917)
COLT 45 AUTO marking on top of the chamber has been added in post WWII (1949)
More precisions if there is or not a letter top rear of the chamber like M,MD, J, S.
https://www.milsurps.com/images/impo...img_0910-1.jpg