1878 German Empire cover Berlin – Templin with 20 Pfennig blue stamp

Original 1878 postal cover from the German Empire, sent from Berlin to the royal district authority in Templin. The front features a blue 20 Pfennig “Deutsches Reich / Reichspost” stamp with a clear circular Berlin datestamp “12 6 78 4–4½ N” and neat old German handwriting. The reverse shows the ori