1950 - 1990, cancelled special collection postal stamps in multiples from W. Pieck, as well ample horizontal pairs and blocks of four, almost all better issues Schönherr BPP or Weigelt BPP expertized among others 251 / 55, 322 / 26, always in the block of four, over 32 block of four heads II, all expertized, furthermore five year plan, W. Ulbricht, large / small buildings, and so on, in addition to it a duplicate stock book, enormous catalog value.