  The Small Magellanic Cloud (SMC) is the only dwarf galaxy in the Local Group
known to have formed and preserved populous star clusters continuously over the
past 12 Gyr. These clusters provide a unique, closely spaced set of single-age,
single-metallicity tracers for a detailed study of the SMC's age-metallicity
relation. Spectroscopic metallicity measurements, however, exist only for 6 of
its clusters. Here we present metallicities for 7 additional SMC clusters based
on Ca II triplet observations. The total sample comprises clusters spanning an
age range of 12 Gyr. Complemented by age estimates from literature these
objects provide us with a well-sampled, well-defined age-metallicity relation.
We compare our first results with the chemical evolution history of the SMC in
terms of a simple closed box model. We find that the general trend is well
reproduced by this model.
