  We examine the production of open charm in antiproton annihilation on finite
nuclei. The enhancement of the subthreshold production cross section, even in a
nucleus as light as carbon, should provide a clean signature of the reduction
in the masses of these mesons in-medium. We also show that a careful analysis
of the $D^+$ and $D^-$ spectra can yield important information on the cross
section for $D^{\pm}N$ scattering.
