Brian,
Commercial Lugers were serial numbered in numerical order until about the 92000 range around 1921. At that point, commercial serial numbering went to the letter suffix style. Your Luger is what is alternately referred to as a "1920 Commercial" (now considered incorrect since manufacture was sometime during or after 1921) or "Weimar Alphabet Serial Number DWM Commercial". It was manufactured from a military weapon with the possible addition of some surplus and/or new parts. It was rebarreled to 7.65mm to comply with the Treaty of Versailles which restricted pistols for civilian use to 7.65mm and a barrel length less than 100mm. You are correct that your Luger was originally a 9mm.
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If it's made after 1918...it's a reproduction
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