1988 Microscopic sea life, complete set of 5 values imperforate horizontally on cover canc. "ΡΟΔΟΣ*2.III.88" (1st day of issue), arr. "ΙΑΛΥΣΟΣ*2.3.88". (Hellas 1788A/1792A).
1990 Europa, complete set of 2 values imperforate horizontally on special illustrated registered cover canc. "ΑΘΗΝΑΙ*11.05.90" (first day of issue). (Hellas 1849A/1850A).