Schkeuditz, Germany

Briefzentrum 4 is the mail processing plant next to the Leipzig airport. It's not within the city of Leipzig but in Schkeuditz which lies between Leipzig and Halle. The stamp shows an optical illusion. The grey at the top and bottom are the same. The top just looks darker because of the black on white band in the middle. The used stamps that came to me in this cover were greatly appreciated.