Watch List notes:

Columbia, Santa Marta. 1820. CU cuarto (22.5 mm, 1.83 g, 11 h). Santa Marta mint. Cross above denomination, tower left, sword right, 1820 below / Cross with S-M, tower and sword. KM B4. aFine, off center. 

Struck during the Columbian revolution. Santa Marta was the last city to fall to the revolutionaries and produced a small series of emergency coinage.