Need identification help, please

[Laura]

Hello all ~

I have inherited a Luger pistol that belonged to my grandfather and is supposed to be from the WW1 era. My fiance is a gun enthusiast and we have been looking through all of his gun books to find info and value for this particular pistol and have reached a dead end. Here is what I know:

-It is a Luger artillery model (I believe it's a LP-08,) with an 8" barrel and 800 meter adjustable sight, 9mm caliber.
-Has DWM logo
-Serial number 635, matches all pieces including the magazine, the only thing we didn't check was the grips.

Now here's what's throwing us a curve ball - there is no date stamped on the barrel. We've found information about Lugers that have a 3-digit serial number with a date, or a 4-digit serial number with no date, but nothing for 3-digit serial with no date.

I know there are lots of forgeries out there, but since all of the serial numbers match, this doesn't seem likely (or else someone paid lots of attention to detail.)

I am able to post photos if necessary - I have a digital camera so I can photograph easily. I've searched this forum and done lots of Google searches tonight but have come up empty. Any help anyone here could provide regarding the age of and/or any info regarding the gun would be very much appreciated.

Thank you in advance for any input!
:-) ~Laura