I am researching a DWM artillery model P08

[Doc Mach]

I purchased a DWM artillery model pistol which has an undated frame without Imperial proof stamps. All small parts have the same last 2 digits of the 4 digit serial number and the frame is also stamped GERMANY. It has the attach point on the grip frame for a shoulder stock. In some ways it appears to have commercial evidence yet in others it has definite military evidence. It does not appear to have been in battlefield conditions and the bluing on the barrel looks too good to be in the field. It also does not appear to have a "halo" around the barrel serial number. I think it might be a 1920 "rework" but would appreciate your review to help with it's provenance. Thank you.