Ditunjukkan sekarang: Costa Rica - Setem-setem bayaran pos (1990 - 1999) - 10 Setem-setem.
25. March WM: Tiada Perforasi: 10½
![[Airmail - Paintings in National Theatre, jenis AKG]](https://www.stampworld.com/media/catalogue/Costa-Rica/Postage-stamps/AKG-s.jpg)
24. May WM: Tiada Perforasi: 10½
![[The 50th Anniversary of Costa Rica-Panama Boundary Treaty, jenis AKH]](https://www.stampworld.com/media/catalogue/Costa-Rica/Postage-stamps/AKH-s.jpg)
![[The 50th Anniversary of Costa Rica-Panama Boundary Treaty, jenis AKI]](https://www.stampworld.com/media/catalogue/Costa-Rica/Postage-stamps/AKI-s.jpg)
![[The 50th Anniversary of Costa Rica-Panama Boundary Treaty, jenis AKJ]](https://www.stampworld.com/media/catalogue/Costa-Rica/Postage-stamps/AKJ-s.jpg)
![[Airmail - National Stamp Exhibition "Exfilcori '91" - Costa Rica - Issue of 1990 Overprinted "Aereo EXFILCORI '91", jenis AKK]](https://www.stampworld.com/media/catalogue/Costa-Rica/Postage-stamps/AKK-s.jpg)
11. October WM: Tiada
![[Airmail - The 100th Anniversary of Basketball, jenis AKL]](https://www.stampworld.com/media/catalogue/Costa-Rica/Postage-stamps/AKL-s.jpg)
11. October WM: Tiada Perforasi: 13
![[The 500th Anniversary (1992) of Discovery of America by Columbus, jenis AKM]](https://www.stampworld.com/media/catalogue/Costa-Rica/Postage-stamps/AKM-s.jpg)
21. October WM: Tiada
![[Issue of 1984 and 1988 Surcharged, jenis AKO]](https://www.stampworld.com/media/catalogue/Costa-Rica/Postage-stamps/AKO-s.jpg)
![[Issue of 1984 and 1988 Surcharged, jenis AKO1]](https://www.stampworld.com/media/catalogue/Costa-Rica/Postage-stamps/AKO1-s.jpg)
1. November WM: Tiada Perforasi: 13¼
![[Airmail - The 50th Anniversary of Social Security Administration, jenis AKN]](https://www.stampworld.com/media/catalogue/Costa-Rica/Postage-stamps/AKN-s.jpg)
