The Honda S600 is an automobile manufactured by Honda. It was launched in March 1964. Available as a roadster – bearing strong resemblance to the Honda S500 – and as a fastback coupé – introduced in March 1965 – the S600 was the first Honda available in two trim levels.
Powered by a DOHC, water-cooled, four-cylinder inline engine with four Keihin carburetors, the engine capacity was increased to 606 cc from the S500's 531 cc. The engine produced 57 hp (43 kW) at 8,500 rpm and had a top speed of 90 mph (140 km/h).
The S600 was the first mass marketed Honda car. First offered only in right-hand drive, it soon became available in left-hand drive to appeal to export markets.
Both the S600 roadster and coupé were available in standard trim and a special, upgraded package called the SM600 which 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.
Honda built 11,284 convertibles and 1,800 coupes for the 3-year span. (wikipedia)
(Photos from honda-tech.com)