As mrerick said it sure sounds like a commercial. These were imported into the US after WWII in good numbers and is probably the most common Luger generally found in the US. You might measure the barrel, if it is under 4" that is also further evidence (absent photos) that it is an alphabet commercial. Also check to see if there is a "Germany" stamp on the frame above the trigger guard, if no that helps the value a bit.
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