1990-12-21: America Issue: Nature at time of Discovery

1990-12-18: Hospitals

1990-12-06: 150th Anniversary of the Penny Black

1990-11-16: For the City of Children (1990)

1990-11-16: Costa Rican Coffee

1990-11-05: America Issue

1990-10-31: Patriotic Symbols

1990-08-24: 50th Anniversary of University of Costa Rica

1990-06-01: FIFA World Cup 2006 - Germany

1990-02-27: National Theatre's Centenary