1868 Cover posted from "ΚΑΛΑΜΑΚΙΟΥ*23 ΜΑΙΟΣ 1868" (pre-adhesive type II !!!!), via "ΚΟΡΙΝΘΟΣ (5)*24 ΜΑΙΟΣ 68" where taxed with 20l. blue (1862/67 issue), arr. "ΑΘΗΝΑΙ (1)*25 ΜΑΙΟΣ 68". Ex. Walraevens collection. Pre-adhesive postmark not listed. A unique postal history document. (Hellas 19b).