My 1917 Navy also has the "GERMANY" stamp, but in a different location. It is underneath the barrel. Also note that a different die was used for my marking.
Was there no consistency in the location of the "GERMANY" export markings?
See picture below. Also, my gun does not have the 1920 date stamp over the chamber.
The apparent flat area on the bottom of the barrel is not real; it is an artifact of the image process when created by a flatbed scanner rather than a digital camera.
Luke