Watch List notes:

COSTA RICA. Republic, 1821-. Set of three coins 1974: 50 Colones, 100 Colones and 1500 Colones. Conservation series. Total (3). KM 200, 201, 202; Fr. 28. AR (2), AU. 25.48; 31.60; 33.56 g. 7599 (2), 2418 ex. Gem UNC
With the Royal Mint's certificate of authenticity.