1920s German real photo postcard showing a Cologne sightseeing motorbus RPPC

Original 1920s German real photo postcard (RPPC) showing a Cologne sightseeing motorbus marked “Höchstenbachs Kölner Fremden-Rundfahrt.” A scarce interwar tourism image documenting an early organized tour vehicle in Köln (Cologne), Germany. The photograph captures multiple passengers seated inside the enclosed tour bus. A clearly visible Black passenger is present among the riders, adding notable social history interest and reflecting the diverse travel presence in Weimar-era Europe. Postcard is postally used with period handwriting on the reverse and consistent aging for the late 1920s (likely circa 1927 based on message date). Real photographic print, not a lithographic reproduction.