  We present observations for three star clusters, Kron 11, Kron 63 and NGC
121, in the Small Magellanic Cloud. We have studied their structure and derived
their fundamental parameters by means of their luminosity functions, their
color magnitude diagrams and the Padova suite of isochrones. NGC 121 is a well
studied object, for which we confirm previous evidence about its old age and
low metal content, and have found that it is undergoing mass segregation. Kron
11 and Kron 63 are poorly populated clusters which had never been studied so
far. Kron 11 is several gigayears younger than NGC 121, while Kron 63 is
basically a very young star aggregate. Both clusters are immersed in dense
stellar fields which share the same population properties, suggesting that in
their cases, cluster ages are consistent with typical ages of field stars.
