Entire letter canc. "CONSTANTINOPLE (TURQUIE)*26.MAI.1838" (French Post Office) and "P.P." (Port Paye) to Nafplion. Oval cachet "ΥΠΕΡΘΑΛΑΣΣΙΑ" in Piraeus, transit postmarks "ΠΥΡΑΙΕΥΣ*22.ΜΑΙΟΣ.1838" and "ΑΘΗΝΑΙ*22.ΜΑΙΟΣ.1838", arr. "ΝΑΥΠΛΙΟΝ*22.ΜΑΙΟΣ.1838". Disinfection slits. Post markings "10/20" on reverse and "50" on front.