The little squiggle under the serial number is a lower case letter and is part of the serial number. The thing that sticks out on the bottom of the frame/grip is a stock attachment lug.
Is the "N" with a crown above it by the release lever vertical "|" or horizontal "--"?
Depending on the answer to that last question, it is likely you have a 1920 Commercial Luger, and the caliber is probably 7.65mm. It is difficult to think that a 9mm round is a tad too long to fit in the magazine (the same magazine works for 7.65mm and 9mm) unless you have 9mm Largo rounds rather than 9mm Parabellum.
(I see that while I was posting this, Ed also came up with the same ideas - I've got to type faster.)
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If it's made after 1918...it's a reproduction
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