I would see if the grips are stamped with any eagle 655, or other acceptance. If so, it is proof positive that that is not a "date" of what it is, but a date of remembrance. (i.e. ANY marking of nazi eagles such as when the pistol was made)
It appears more to me dates of someone close to whomever owned the luger. Dad, Uncle, etc. 1923 - 1945 is someone approx 22 years old at the end of WW2...
Unless you have provinance, then this is all guesses....
Ed
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