Hapidogbreath, congrats on your Luger. For disassembly, best to use a Luger takedown tool, or “loading tool” from Sarco for $8.45. The tool has a flat-head screwdriver on one end that fits the grip screws and the rear of the breechblock, and a hook or spade on the other that gives your thumb leverage to pull down the magazine follower and simply drop the cartridges in. The hole in the middle fits around and under the follower button on the magazine. Very handy and a good way to avoid damage to the gun and wear and tear on your thumb. If you get a Luger holster you’ll find there is a pocket sewn in for the tool. BTW, a “genuine” loading tool may have the serial number or a portion of it such as the last two numbers from the gun it was issued with, and an inspector’s mark. I use quotes because these are the easiest things to fake (phony Nazi acceptance stamps, etc.) and can be found for sale for many hundreds of dollars on the auction sites.
To disassemble your Luger, the correct way (in the old German manuals) is to remove the magazine, clear the chamber and make safe, then hold the gun in one hand just like a Glock, and pull the action with the arched fingers against the thumb hooked around the grip. Then follow the sequence I describe below in MY way to do it. I just place a towel on the bench or table to act as a cushion. Put the muzzle on the towel and put some weight on the gun or bear down enough to open the action just a bit, then with your other hand turn the takedown lever (above the trigger on the left side) down until it is hanging vertical to the gun (at right angles to the frame rails). That will unlock the sideplate so take it off the gun (pull it forward and up away from the frame) and set it aside. The rear of the sideplate fits under and into the frame lip. If it’s stubborn, it may be caught by old oil so gently tap it with a piece of wood or plastic rather than trying to pry it off.
Turn the gun over (so the toggle hook can disengage from the mainspring catch inside the grip frame) and slide the receiver ahead and off the frame. When you reassemble this will be a critical point; you will need to see the juncture of the toggle hook and the mainspring catch and make sure the hook and catch engage and stay engaged as you pull the receiver back to its place between the frame ears. Now turn the receiver up again and fold the toggle arms up and slide the breechblock out of the receiver. It’s a delight to feel these precision-honed parts moving so easily and smoothly together. At the rear of the breechblock is a screw head that is the base of the firing pin housing. It’s spring-loaded, so depress it in and turn the screw counterclockwise past the detent and the firing pin housing will come out the back. As always when disassembling any gun, beware of small coil springs that can shoot out and get lost or injure your eye. You probably know this as a gun guy.
I usually take the grips off next. Be very careful with these, as they kinda slide up and in, and down and out, and especially on the left grip which is caught under the thumb safety axle. Many Lugers have a chip or splinter taken out of the left grip because the disassembler didn’t slide the grip down and up away from the grip frame, but just went up and cracked the wood out at the safety notch. I think it’s called the million dollar chip or something, and its meaning is the same as the idiot scratch on a 1911. I don’t have any experience with polymer grips such as found on Mauser-built Lugers and Krieghoffs, as well as on some VOPO Lugers, so this might only apply to wooden grips.
So now you’re field stripped. Further disassembly is usually not required for routine maintenance. MidwayUSA has several Luger manuals in their books section, ranging from cheap (under $10) to moderately expensive, and there are several Youtube videos showing it being done too (I recommend the one by Iraqveteran888).
The “X” is, I’m told, usually applied with a screwdriver and ball peen hammer, the chosen tools of the Soviet armorer. I’ve only seen pictures at auctions, never handled one, but the X is usually found on the left side at the serial number on military guns. VOPO guns are East German and don’t have the Soviet flair to them anyway and so typically lack that mark. The other marks on the right side are (to my eye, anyway, moving left to right on your picture):
RC --- In a government-owned armory like Erfurt, there was a Revisions-Commission (RC) made up of the Chief inspector and the Chief Administrator that kept the master and slave gauge sets and could overrule decisions made by the inspectors; usually reversing a failed inspection upon correction of the problem or if there was another reason to pass the firearm despite the out of spec issue.
Crown/B --- Inspection mark at Location 3 -receiver hardened
Crown/F --- Inspection mark at Location 26a -”Pistol ready for proof firing”
Crown/P --- Inspection mark at Location 26c -final acceptance of the receiver
Imperial Eagle --- pressure test proof mark at Location 26b
The military inspectors’ marks are generally the initial of the inspector, in old English script or German fraktur script, with the crown representing the Imperial Authority, and following the German tradition of assuming personal responsibility in craftsmanship. Your Erfurt is from a highly-respected factory. When DWM got the first army contract for the pistol that would be known as the P08, one of the terms was that the Government had the right to start manufacturing on its own after, I think, the first 50,000 pistols were delivered. That first government factory was Erfurt, and later Spandau in Berlin. Government work was oriented toward military requirements only; precision, reliability, while DWM’s tooling and assembly process had to match multiple militaries’ and commercial contract requirements. Sometimes you will hear that Erfurt Lugers are “rough” or not as nicely finished as DWM from the same period, but it’s an honorable roughness, so to speak. I understand that for some reason the Soviets hot-dipped the Lugers they were exporting, so you might consider having it refinished. Anyway, best of luck with your Luger.
Cheers,
Popoff