Entire letter canc. "CONSTANTINOPLE (TURQUIE)*28.MARS.1838" (French P.O.) and boxed "PP" (Port Paye) to Nafplion. Oval cachet "ΥΠΕΡΘΑΛΑΣΣΙΑ", transit postmarks "ΠΕΙΡΑΙΕΥΣ" (type I) and "ΑΘΗΝΑΙ*21.ΜΑΡΤΙ.1838", arr. "ΝΑΥΠΛΙΟΝ*21.ΜΑΡΤΙ.1838". Postage markings "30" (decimes) and "18" (kreuzer). Very fine and scarce.