1990-11-16: Sanctuary of Our Lady of las Lajas, Ipiales

1990-11-01: Christmas 1990

1990-10-12: America Issue: Nature by time of discovery

1990-09-29: Salesian Brothers in Colombia, Cent.

1990-08-28: Trees

1990-08-06: Nature Conservation

1990-07-26: Museum of Gold, 50th Anniv.

1990-07-01: Salt extraction by sea water

1990-06-27: Organization of American States, Cent.

1990-06-08: Football World Cup 1990, Italy

1990-05-22: Institute of Industrial Development, 50th Anniv.

1990-05-19: Trans-Caribbean Submarine Fibre Optic Cable

1990-05-16: General Santander Police Academy, 50th Anniv.

1990-05-06: First Postage Stamp, 150th Anniv.

1990-05-06: Death of General Santander, 150th Anniv.

1990-04-10: Ibero-American Theater Festival, Bogota

1990-03-28: Teresa Cuervo Borda, Birth Cent.

1990-03-28: Flora

1990-03-01: City arms

1990-02-16: Broadcasting company "Radio Nacional de Colombia",50th Anniv

1990-02-15: Inter-American Convention on drugs, Cartagena