San Luis Potosi mint, KM377.12, DP-Pi58 (“very rare”). Normal date variety. Gun Metal toned Uncirculated with strong mint bloom and well struck features. A very rare date, eminently collectible in any grade and vastly desirable in this fine quality. Currently the single finest (and only MS) example at either major third-party grading company and among the very finest extant. We presume this example is one of the “three (known) Uncirculated examples” referenced in the DP reference work.