In 1973 Citroen launched the rotary engined version of the GS - the
Birotor. It had the typical reliability problems of rotary engines at the time - as well as the stupidly thirsty fuel consumption - so Citroen tried to buy every one back and scrap it. Quite a few people have held on to theirs so I suspect (given the production numbers) that quite a few EV-1s have also escaped.