I had an East German PP for a while. It had been nicely but heavily refinished, and had a Hammerli mark stamped on the barrel mounting under the slide. I have no idea why. I can't recall what import stamps it had. It still had flat wooden East German grips.
It was stunningly accurate, even though I was not an excellent shot. What it wasn't was reliable. It had feed jams in some way that seemed to involve the chamber-loaded indicator pin and jammed the slide in place so it was difficult to clear. The single action trigger pull was good, but the DA pull was not, which is apparently the norm for Walther PP's.