20l Hermes Head stationary letter card mailed registered, fr. add. with 2x5l+10l.+20l 1896 Olympic Games canc. "ΑΘΗΝΑΙ-3*11.ΜΑΙΟΣ.1896", via "BRUXELLES*27.MAI", arr. "GAND*27.MAI.1896". Rare and unusual. (Hellas 111+112+113).