Hello Doug,
Here is a partial copy of page 143 from R. Gibson's book, "The Krieghoff Parabellum" :
Your frame appears to be very similar to the specimens shown by Gibson.
I have also copied the listing of "back frame inscribed" DWM-HK guns that Gibson had recorded at the time his book came out. This table is from page 142 of the book :
Gibson speculates on page 139 that "...Quite possibly the whole 10,000i block of the range was acquired by Krieghoff, but no numbers below 2,000i have been recorded with Krieghoff markings."...
Your frame's serial number certainly falls within the range recorded by Gibson in the table, above.
Too bad your frame got separated from the rest of the DWM-HK luger somewhere along the way.
Not sure if I can help anymore...I was hoping John D. would jump in...
p.s. Does your frame have any proof mark on the left side frame rail, near the front end of the rail ? Gibson says this would have no marking if the receiver (now not with your gun...) was stamped with a vertical C/N proof. But if your frame rail is stamped with a lazy HK C/N proof, Gibson says the receiver would have the same proof, just above where it appears on the frame rail.
Regards,
Pete... <img border="0" alt="[typing]" title="" src="graemlins/yltype.gif" />