pillars and waves type of cob coin - spanish silver - 1651 to 1773 era --(122 year range) the flip side should be the fully "dated" side but the 2 numbers in the middle above the wave that you see is the last two digits in the "date"-- now if it was say 62 -- the date would of course be either 1662, 1762 - --these coins were made in these 4 mints --bogota, potosi, cartagena, lima --- the "treasure" fleet mints * that made coins for the treasure fleet to carry home .