Referring to Ron Wood's excellent "Early frame tutorial" for comparison, I would have said this frame is a Type V. If that's the case then it could be from a (short frame) 1906 Commercial, with grip safety ?
Mark

Could be, if the serial number has been removed/replaced.

1913 dwm
 

Sent more pic. of inside of Luger, but I don't see them posted yet. Both the serial no# match on the upper receiver and the lower frame. I counted the coils on the recoil spring and it look 15- 16 coils. Have you guys given up or are you still trying to figure it out? Hope you guys had a great Xmas.

Tough to count springs in a picture- 15-16 sounds ok.

If you will post the picture of the inside "well" that I asked for, we can likely ID your frame. See my previous post for the picture to take.

1913 DWM Luger
 

Took more pic. of inside of pistol. Took pic of inside of pistol well where take down lever passes through. These pic. were sent to 4 Scales.

Here are the latest batch of photos including the frame well. I have done what I can to enhance, but these are very low resolution and there just isn't much to work with.

I can see markings in the well, but not good enough to ID.
Got to be closer and in focus, and with the lever in its closed position please, or removed.

Yes, the frame well needs to show detail equivalent to post #37.

1913 DWM frame well pic
 

Did you get the 2 pic of the inside of frame well that I sent today? Hope this was what you were looking for.

Here they are.

Pic of lower frame well
 

Were you able to see the marks in the frame well?

No,
too much reflection. The key is can you see an "N" or circled "N" in there, or some other markings that you can describe to us?

I think the major problem is low resolution. The photos you sent me were only 30K in size, which is very small and doesn't really let me enhance. I would encourage you to play with your smartphone or borrow a better camera and try to take bigger/sharper photos. This forum will allow us to post photos up to 195K size, which is over six times more data than were in your photos. All other things being equal, six times sharper/more detail.

Take it outside in the shade~

Will try to get better pic. of inside of well this week end outside if it is not raining. The marks in the well are C O 8 and the forth mark look like a arrow head.

Took 3 new pic. 2 of inside of frame well and 1 of barrel that shows the cross clearer.

4 Scale did you get the last 3 pic I sent you.

No photos received.

1913 dwm
 

Resent pic today.

Here's another.