1991-12-02: National Development

1991-11-16: International Stamp Exhibition PHILANIPPON '91, Tokyo

1991-10-12: Discovery of America, 500th Anniversary (2nd series)

1991-07-10: International Stamp Exhibition ESPAMER '91, Buenos Aires

1991-06-15: Airplanes 1980 Definitive issue

1991-04-26: Spacecrafts issues of 1990 with surcharge handstamped

1991-04-25: Summer Olympic Games 1992 - Barcelona (III)

1991-04-13: Khmer Sculptures

1991-03-30: Winter Olympic Games 1992 - Albertville (1991)

1991-02-15: FIFA World Cup 1994 - USA (1st series)

1991-01-07: National Day