East Germany decided to upgrade the fortifications in the late 1960s to establish a "modern frontier" that would be far more difficult to cross. Barbed-wire fences were replaced with harder-to-climb expanded metal barriers; directional anti-personnel mines and anti-vehicle ditches blocked the movement of people and vehicles; tripwires and electric signals helped guards to detect escapees; all-weather patrol roads enabled rapid access to any point along the border; and wooden guard towers were replaced with prefabricated concrete towers and observation bunkers. 
West Berliners initially could not visit East Berlin or East Germany at all. All crossing points were closed to them between 26 August 1961 and 17 December 1963. In 1963, negotiations between East and West resulted in a limited possibility for visits during the Christmas season that year ( Passierscheinregelung ). Similar very limited arrangements were made in 1964, 1965 and 1966. In 1971, with the Four Power Agreement on Berlin , agreements were reached that allowed West Berliners to apply for visas to enter East Berlin and East Germany regularly, comparable to the regulations already in force for West Germans. However, East German authorities could still refuse entry permits.
If you’ve never owned a GSD before you want to make sure you make the right choice. You will probably be looking for one with a medium drive, balanced nerves, clear head and does not push back too much. Picking out a quality GSD is vital for understanding what the possible outcomes will be. Making sure the puppy you get has the genetics you’re looking for is only the first step. Making sure the puppy receives proper training and socialization will also determine the outcome. Show lines would probably fit what you are looking for but a properly bred and trained working line with medium drive should also be considered. We are currently taking deposits on 2 different litters of working lines which may produce what you are looking for. If you decide to go with a show line I currently only have one adult male and no planned breeding at this time. You can contact my friend Anthony at http://