In 1970, at the Tokyo Motor Show, Mazda debuted the RX500 concept car. A radical departure from the Japanese firm’s previous offerings, the in-house developed RX500 was a futuristic-looking coupe that featured forward-swinging butterfly doors and a mid-mounted, 982-cc, two-rotor Wankel engine producing 247-hp and capable of pushing the lightweight, one-off prototype to a 150 mph top speed.
