1973-12-20: 50 ° anniv. Interpol

1973-12-15: Moon Flight of Apollo XVII

1973-11-30: President

1973-11-02: 500th Anniv. of the Birth of Nicolas Copernicus (1473-1543)

1973-10-20: Centenary of the World Meteorological Organization

1973-10-09: World Day of the UPU

1973-09-28: Europafrica

1973-09-17: African Fortnight Brussels

1973-09-12: U.a.m.p.t.

1973-08-16: Garcinia punctata, overprint

1973-06-26: Flora and Fauna (1973)

1973-06-08: Plants 1973

1973-05-30: 10th Anniversary World Food Program

1973-05-17: 5th World Telecommunications Day

1973-04-07: 25 ° anniv. from W.M.S.