Seems to me that it is a 1917 Artillery DWM, rebarreled, not simply shortened. Interesting that they used the full serial number inside the grips. The other marks may be from a previous gun that they were on?
An interesting piece to the Police Luger collector.
dju

The barrel has been shortened and the sight band re-installed. A really nice job.
A tip of the hat to David (ithacaartist).
Ron

3" barrel for a "baby" luger and how it is done:

Awesome thanks for all the input guys! I’ve learned a lot so far. I just wish I knew when and what police were using this Luger. Is there a good chance this was used later by the Nazis? I’m just trying to find a logical story to how this pistol became a bring home from WW2.

Yes, it is quite logical that it served in WWI, the Weimar police,
and after 1934 the police were still the "Police" but you can call them
Nazi if you want.

If it was/is a WWII bring back, of course it saw service until souveniered!

Don is correct that the frame is Erfurt while the receiver is DWM.

The C/RC (Revisions Commission) stamp indicates a part that the factory inspectors found a non-critical fault with but was passed as serviceable by RC inspectors. In the event of failure of such a part, the RC inspector would accept the responsibility. The C/RC is more often seen on Erfurt parts than on DWM. Below is an Erfurt receiver also marked C/RC.

https://i.imgur.com/ChbWw6e.jpg

Were most Lugers around 1932/3 refinished the way mine is or is there a good possibility it was done by non-armory?

I also posted a picture (post #16) of the inside of my grips and they had some interesting markings. Does anyone know what those are and mean?

So does that mean the frame was replaced or an Erfurt RC inspector inspected this DWM possibly after WW1?

The receiver was made by Erfurt, the "defect or variance" was noted and either corrected or passed by the RC at Erfurt, at the time the pistol was first made.

Corrected: the receiver is DWM, the mid link(and perhaps the entire toggle) is DWM and is a later replacement.

The pistol is an assemblage of parts, so asking question is fine- but don't expect any definitive answer about when it was done or who
re-worked or refinished it. JMHO.

I thought the markings on the side was for military DWM?

I read these markings are DWM

I also read that DWM made most of the Artillery Lugers. Maybe my references are incorrect

Your receiver is DWM. Compare the DWM Eagle stamp on your Luger to the Eagle on my Erfurt receiver.

DWM did make far more Artillery Lugers than Erfurt. Erfurt only made Artillery Lugers one year: 1914. Jan Still says that only 23,000 Erfurt Artillery Lugers were made. Manufactured in blocks of 10,000 with the first block not having a suffix letter, the highest serial number Erfurt Artillery Luger will have a "b" suffix letter. DWM made them from 1914 until 1918.

It is interesting that many DWM Artillery Lugers have barrels supplied by Erfurt as indicated by the Prussian Eagle - the Eagle used by Erfurt inspectors - on the barrels near the right side of the receiver.

Is my frame a Erfurt then? Sorry for all the questions, just trying to figure out my lugers story. Been learning a lot from you guys

Erfurt
 

Your frame has an "RC" stamp on the trigger guard, so it is an Erfurt frame. The "RC" stamp was almost never (or never) used on DWM pistols as they were a private firm and agreed to deliver pistols without flaws of any kind. The military arsenal at Erfurt could pass pistols with minor flaws with a government inspector signing off on it.

Hi Alex,
I'm of the opinion that your gun is an Erfurt with some replaced and renumbered parts from a DWM. Specifically the center toggle, side plate and possibly some other small parts.
Regards, Norm

I did a lot of reading and it makes sense. A lot of the artillery Lugers were destroyed or converted for police use. Is there a way to tell when the Erfurt frame was made?

Not exactly, quick answer is 1914 to 1918, since it has the artillery sight cut on top of the chamber.
If the upper matches the lower, the date on the chamber is the year it was made.

The OP frame is definitely Erfurt, it has Erfurt eagle not DWM.
It also has the Erfurt inspection on the trigger guard, something that DWM did not do.