ITU: Uruguay (single & souvenir sheet); Paraguay (perforated set, imperforate set changed colors, 2 souvenir sheets)
What is the only city in Germany to have 2 rail stations designated as Hauptbahnhof within its boundaries?
Competition is open to everyone. Winning entry will be the first to name the correct city received at or before 8 PM, August 8, 2022, eastern US time. If no correct response is received, the first response naming any German city will be the winner. My decision as to the winner will be final. Good luck!
Will