Hi Thomas,
Welcome to the forum! You have a World War 1 DWM Luger manufactured in 1918. Does the serial number on the pistol's frame just below the barrel have a small letter underneath it? This would help better identify when it was made.
Detailed photos are a must to further identify your Grandad's heirloom. Take close up photos of all markings as well as the overall pistol and holster images and post them here so that memberts can further help you.
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