Dave,
Value of a luger depends on matching numbers...as you have said...but also if the finish is factory original, % of bluing and % of strawing remaining, condition of the bore, and the condition of grips and magazine.
It is difficult for folks to give ya a ball park w/out a bit more info.
p.s. Holding the gun upside-down when removing and replacing the receiver on top of the frame helps the "stirrup" fall into place easier as well...
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