David,
Your Luger is classified as a DWM Alphabet Commercial... formerly known as a 1920 commercial. It was made in late 1923. The 'm' under the serial# is part of the S#. Yours is #235m. The correct mag for it should have an unmarked wood bottom or a GERMANY stamped wood bottom. The mag tube is nickle plated tin, not aluminum.
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Mike C.
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