I recently acquired a 1911 made in 1918. It has been through an Augusta Arsenal rebuild in it's life. The barrel is not correct, but the orientation of the markings has me puzzled. Neither of the reference books I have looked at show the S and P with the exact location/orientation that I have. I am probably going to eventually try to get a correct barrel, but in the interim I'd like to know what this one is.

Thanks in advance.
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