COSTA RICA. Banco Central de Costa Rica. 500 Colones, 1970-77. P-225b. PMG About Uncirculated 53. Printed by ABNC. May 4th, 1976 date. This About Uncirculated note boasts dark purple ink showcasing intricate lathe work on the reverse. PMG Pop 1/5 Finer. PMG comments "Rust, Pinhole."