The S600 (1964-66). Only 11,284 roadsters and 1,800 coupes were built. The special, upgraded package called the SM600 included, among other items, special paint colors, exclusive badging, a standard radio and speaker, a special antenna in the passenger side sun visor, standard reversing lights, a standard cigarette lighter, a standard heater, better cushioned seats, and a detachable seat track for quick removal of the passenger seat. (Wikipedia)
