Small cover (envelope) canc. "STOCKHOLM*29/8 1851" and boxed "Aus Schweden" to Athens. On reverse 2-line "OSTBAHN 3/9" and ambulant "BERLIN - LEIPZIG VII T*3.9", "BERLIN-BRESLAU II T*3.9." and "COSEL-ODERBERG II T*4.9", arr. "ΑΘΗΝΑΙ*6.ΣΕΠΤ..." (not very clear). Also two more ambulant German postmarks, dated 2.9 and 4.9 but illegible. Very fine and scarce.