Issued by Greece (Hellas) in 1978, this commemorative stamp celebrates the 150th anniversary of the Greek Postal Service. The design features an early steam locomotive transporting mail, symbolizing the historical role of railways in accelerating postal communication across the country. The detailed illustration captures a classic train with mail carriage traveling through a scenic landscape, reflecting the modernization of mail delivery in the 19th century. The inscription in Greek, “150 ΧΡΟΝΙΑ ΤΑΧΥΔΡΟΜΙΚΗΣ ΥΠΗΡΕΣΙΑΣ,” translates to “150 Years of Postal Service.” This stamp is a notable collectible for philatelists interested in postal history, transportation themes, and Greek commemoratives.