In 1989, East Germany’s communist regime was overwhelmed by the democratization sweeping across Eastern Europe. On the evening of November 9, 1989, East Germany announced an easing of travel restrictions to the West, and thousands demanded passage though the Berlin Wall. Faced with growing demonstrations, East German border guards opened the borders. Jubilant Berliners climbed on top of the Berlin Wall, painted graffiti on it, and removed fragments as souvenirs. The next day, East German troops began dismantling the wall. In 1990, East and West Germany were formally reunited.
The shutter was fine. Slow speeds buzz nicely, as does the self-timer. This is one of the later models, because the Prestor shutter tops out at 1/750. That's quite a feat for a leaf shutter, although I know that some Copals hit 1/1000. Regardless, the Prestor shutter is excellent. It's a bit different from other leaf shutters in that it uses a double-blind system. Most leaf shutters are self-capping. That is, they don't open when you tension them. The Prestor has another level of protection. The blind slides out of the way when the shutter is tensioned and back into place after the shutter is closed.
By the 1970s, the Stasi had decided that the methods of overt persecution that had been employed up to that time, such as arrest and torture, were too crude and obvious. It was realised that psychological harassment was far less likely to be recognised for what it was, so its victims, and their supporters, were less likely to be provoked into active resistance, given that they would often not be aware of the source of their problems, or even its exact nature. Zersetzung was designed to side-track and "switch off" perceived enemies so that they would lose the will to continue any "inappropriate" activities.