  The metallicity in portions of high-redshift galaxies has been successfully
measured thanks to the gas observed in absorption in the spectra of quasars, in
the Damped Lyman-alpha systems (DLAs). Surprisingly, the global mean
metallicity derived from DLAs is about 1/10th solar at 0<z<4 leading to the
so-called ``missing-metals problem''. In this paper, we present high-resolution
observations of a sub-DLA system at z_abs=0.716 with super-solar metallicity
toward SDSS J1323-0021. This is the highest metallicity intervening quasar
absorber currently known, and is only the second super-solar absorber known to
date. We provide a detailed study of this unique object from VLT/UVES
spectroscopy. We derive [Zn/H]=+0.61, [Fe/H]=-0.51, [Cr/H]=<-0.53, [Mn/H] =
-0.37, and [Ti/H] = -0.61. Observations and photoionisation models using the
CLOUDY software confirm that the gas in this sub-DLA is predominantly neutral
and that the abundance pattern is probably significantly different from a Solar
pattern. Fe/Zn and Ti/Zn vary among the main velocity components by factors of
\~ 3 and ~ 35, respectively, indicating non-uniform dust depletion. Mn/Fe is
super-solar in almost all components, and varies by a factor of ~ 3 among the
dominant components. It would be interesting to observe more sub-DLA systems
and determine whether they might contribute significantly toward the cosmic
budget of metals.
