These DWM alphabet commercial Lugers are from the Weimar era of Germany, with yours made about 1923. I have one made just 25,000 or so after yours, in the "m" block.
The "k" is a suffix and part of your Luger's serial number.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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