A factory original collectible matching original finish DWM Alphabet Commercial in .30 Luger might be worth $1,000... But not something with aftermarket parts. Others in that caliber might be worth considerably more.
You may have seen a Swiss Luger. They are often in .30 Luger, and have longer barrels. That would be worth more than $1,000 if all matching and in reasonably high condition.
But then you said it is a mismatch, so not collectible. $600 max.
Photos are almost always needed to get any accurate response on the forum because you need to understand specific things before evaluating and estimating the value of a Luger.
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