The aluminum bottomed mags were phased in in the Weimar era, at roughly the same time that your barreled upper receiver. The upper is a 1918 dated piece. It could be an Erfurt manufactured receiver based on the Artillery sight notch, but only a closer inspection of the marking would confirm that it is Erfurt versus DWM. The "1920" is not a date but a property mark placed there by the Weimar Goverment to state that the weapon was in the inventory allowed the German goverment by the Treaty of Versailles.
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