Pistol identification

[llc]

I am sure the expertise on this board can provide information on my Luger. The pistol is a 30 cal. The serial number is 1602 with an altered e below the number. The proof marks are a cross on top of a crown with the letter N below the crown and a pentagon inside the crown. The serial number only appears on the front of the frame and on no other parts. The proof marks are on all the major parts and are stamped laying on edge. The pistol must be held muzzle up to read them. Appearance leads me to believe all the parts are matched originals. The toggle has DWM engraved on it and the toggle grips are flat, not the dished kind. The extractor is marked with geladen (loaded) and the safety is on when in the most rearward position. GESICHERT is stamped in all upper case letters by the safety lever. The pistol is also equipped with a grip safety. The magazine has no markings at all, appears to be stainless steel and has a brown plastic (bakelite?)grip on it. The pistol grips appear to be walnut. The pistol was equipped with a stock lug but the previous owner indicated his Father had it ground of in the 30's to comply with some federal law. The pistol has about 85% or better blueing but shows pitting on the right side where the previous owner had it laying in his sock drawer for the last 45 years. Is there somewhere I could have the lug skillfully replaced or should I just leave it like it is.....any information or help is appreciated.......Thank you.....Larry Cribbs