Commercial cover (1928) from "ΜΥΤΙΛΗΝΗ" to "ΑΘΗΝΑΙ" franked with 1,50 Drs. Navarino issue and cancelled with maritime cachet "ΑΤΜΟΠΛΟΪΑ ΜΑΝΟΥΗΛΙΔΗ * ΠΡΑΚΤ. ΜΥΤΙΛΗΝΗΣ" and "ΠΕΙΡΑΙΕΥΣ ΑΠΟΣΤΟΛΗ". On back "ΑΘΗΝΑΙ - ΑΦΙΞΙΣ 11.06.28" (Hel. 485)