Hi CJ, First welcome to the Luger Forum!! If your Luger has a chamber date of 1915, the chances are pretty good your pistol is a 9mm Luger (Parabellum).
If you can find a 7.65 (.30) Luger round, try to insert it into the business end of the barrel. If it goes all the way in, your Luger is a 9mm, if it doesn't, then you have a 7.65 (.30 Luger).
Let us know what you find out!
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