I truly appreciate that Information! Its fascinating to find out that it could have been a modification. I did something similar in Afghanistan with my mag pouches, removed the elastic retention straps for quicker removal haha.
No markings anywhere other than those two places. none under flap, not even the slightest impression or sign of a stamp or written marks.
the markings on back strap of pistol actually is the same as one on the holster, cant believe i never payed any mind to it. it states
SKO. I. N.7. 54 its moderately scrunched together, but still distinctive. the O has two dots over it. its kinda small so i figured it was an import mark.
also, im not sure what a police safety would be but it does say geirshert "spelling unsure, not home with it"
"bare in mind all I do is shoot it when i do reenactments, so if what i missed seems oblivious, forgive me

"
the gun also had a spare barrel, and grips as well, but they do not match, or bear any markings best I can tell. also the id card pictured has always been with the weapon. The wehrmacht id card has alot of unit information in it as well, along with his deployments. If this would help or your interested ill provide anything you would like.
also more pictures if you want. or if it would spark your desire to investigate it
Once again thank you very very much. I actually as typing this am visiting my grandparents, it pleases him very much to finally have an idea of what he had. you guys made a grumpy old man a school girl