1886 German Empire cover Oldenburg in Holstein to Berlin with 10 Pfennig stamp

Original 19th‑century postal cover from the German Empire, sent from Oldenburg in Holstein to Berlin in 1886. The front shows a red 10 Pfennig “Deutsches Reich / Reichspost” stamp with a clear boxed cancellation “OLDENBURG IN HOLSTEIN 28 1 86”. The envelope is addressed in attractive old German hand