1914 DWM Luger Proof Marks

[rdesi54]

Looking for info on the proof marks on this DWM 9mm Luger. It is dated 1914, has a 4 digit serial number with an odd shaped u beneath the serial number. I have run across one other DWM Luger with the same markings but no info with it, just a pic. I am sure the grips are not originals. It must have been re-worked at an arsenal somewhere along the line as some parts do not match the last 2 digits of the serial number. It would be interesting to obtain some info on this gun, when it could have been produced, if it could have been used during WW1 and WW2 and what the proof marks mean. I am not looking to sell this one just interested in info! My dad picked this up during WW2 and it has been passed down to me.

I have taken it in to the local gun store, they looked it over and said it was in great shape for firing. I hadn't shot the gun for several decades, so we took it out and ran 50 rounds thru it, works very well and is very accurate for being around 100 years old!

Any info will be greatly appreciated. Thanks in advance!