The OM2S is listed as being made from 1984 to 1988, OM2 listed as being made from 1975 to 1979 and there are several different versions of the kit as being listed, and range from about $600 to $865 if you got the black kit with the 55mm f/1.2 lens model.

The OM2S is listed as selling from about $440 to $865 with the 55mm f/1.2

Dave