Entire letter canc. "ΠΡΕΒΕΖΑ" (type I), via "ΒΟΝΙΤΖΑ*1?.ΙΑΝΟΥΑΡ.1857", arr. "ΠΑΤΡΑΙ*20.ΙΑΝΟΥ.1857". Cachet "ΥΓΕΙΟΝΟΜΕΙΟΝ ΒΟΝΙΤΣΗΣ". Rate mark handwritten "50" (lepta) charged as due on arrival. THIS IS THE ONLY KNOWN TYPE I PREVEZA POSTMARK, AN ITEM OF THE GREATEST RARITY.