Hi Matthew,
Welcome to the forum. Your DWM Luger was made in 1918 for the German army. It is a 9mm. The 8,83 stamp on the barrel is the bore gauge, measured from land to land in millimeters. The 1920 stamp is a property mark (not a date). It was added during the Wiemar era showing it was government property. The unit mark experts will chime in shortly to decipher them for you.
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Mike C.
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