The script m is actually part of the serial number. Military and inter-war commercial Lugers were numbered in blocks of four digits and a letter. Numbering started with 1, went to 9,999, and then went back to 1a (1 with a letter suffix) for the next 9,999 guns, and so on through the alphabet.
NOTE, that this letter, as part of the serial#, should be included in any records you keep or any licensing or registration you are required to obtain. You can see that, in the manufacturing range of inter-war Lugers, there are potentially 26 Lugers with serial# 1900, it is the letter suffix which differentiates them.
The crown/N stamp is the commercial nitro proof mark, and GERMANY is an export stamp.
The term "1920 Commercial" has been used for many years to categorize inter-war Lugers in general. Recently, many collectors have begun to identify these guns by different designations, which are a bit more useful in describing a Luger's origin.
Your gun is what is coming to be called an "Alphabet Commercial", that is, an inter-war Commercial Luger which is numbered in the Military manner (four digits and a letter suffix). Your serial number indicates that your Luger was probably manufactured in late 1923.
--Dwight
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