This pair belongs to the celebrated “Tourist Attractions / German Architecture” definitive series, featuring notable cityscapes and landmarks across West Germany.

• The left stamp (20 Pf, olive green background) depicts Stuttgart, highlighting the city’s skyline with its blend of medieval towers and modern structures, including the Stiftskirche and TV tower.

• The right stamp (20 Pf, blue-green background) shows the Bremen Market Square, centered on the ornate Rathaus (Town Hall), symbolizing the city’s Hanseatic heritage and architectural splendor.
  Collector’s note:
  These issues are prized for their stylized modernist design, balancing clean geometry with architectural detail. They are part of a long-running series (1964–1975) celebrating West German cities, often collected both mint and used for their aesthetic and historical significance.