Hi Guys,
The grips are not the commonly found VoPo grips and the quality of these grips doesn't even come close. So I rule out the DDR 'VoPo' reworking. Check for a crown/N fire proof on the barrel, that'll help.
It appears to come from a post-war source, and there were quite a few. The fact that small parts have not been blued over and that it lacks both VoPo grips and a new VoPo barrel pretty much rules out Eastern-Germany as source.
I would advise you to swap the grips for some more decent ones, perhaps the newly made Nill-grips. It will do this gun justice. After all, it has served in 2 wars, the days between and a number of years after the last war. You can't get more history in a handgun than that