Hi Erik, Welcome to the forum! Your gun seems to have been assembled from parts from three different guns (at least). The frame is from a 1917 Navy, the receiver from a 1918 Artillery, and the barrel and toggle train from another gun. As Doug has told you, the 1920 is not a date, but a property mark. May we see more photos, the serial numbers on the front of the frame and the bottom of the barrel, the inspection marks on the right side of the receiver and also one of the back of the holster.
Regards, Norm
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